diff --git a/src/egs_game.erl b/src/egs_game.erl
index eb67544..fc178d5 100644
--- a/src/egs_game.erl
+++ b/src/egs_game.erl
@@ -546,7 +546,7 @@ event({npc_shop_buy, ShopItemIndex, QuantityOrColor}, Client=#client{gid=GID}) -
 	RarityInt = Rarity - 1,
 	psu_game:send(<< 16#010a0300:32, 0:64, GID:32/little, 0:64, 16#00011300:32, GID:32/little, 0:64,
 		GID:32/little, 0:32, 2:16/little, 0:16, (psu_game:build_item_variables(ItemID, ItemUUID, Variables))/binary,
-		UCS2Name/binary, 0:NamePadding, RarityInt:8, Category:8, SellPrice:32/little, (psu_game:build_item_constants(Constants))/binary >>);
+		UCS2Name/binary, 0:NamePadding, RarityInt:8, Category:8, SellPrice:32/little, (psu_proto:build_item_constants(Constants))/binary >>);
 
 %% @todo Currently send the normal items shop for all shops, differentiate.
 event({npc_shop_enter, ShopID}, Client=#client{gid=GID}) ->
diff --git a/src/psu/psu_game.erl b/src/psu/psu_game.erl
index 765dc51..df5dff7 100644
--- a/src/psu/psu_game.erl
+++ b/src/psu/psu_game.erl
@@ -199,31 +199,7 @@ build_0a0a_item_constants([{ItemID, _Variables}|Tail], Acc) ->
 	UCS2Name = << << X:8, 0:8 >> || X <- Name >>,
 	NamePadding = 8 * (46 - byte_size(UCS2Name)),
 	<< Category:8, _:24 >> = << ItemID:32 >>,
-	DataBin = build_item_constants(Data),
+	DataBin = psu_proto:build_item_constants(Data),
 	RarityInt = Rarity - 1,
 	Bin = << UCS2Name/binary, 0:NamePadding, RarityInt:8, Category:8, SellPrice:32/little, DataBin/binary >>,
 	build_0a0a_item_constants(Tail, [Bin|Acc]).
-
-build_item_constants(#psu_clothing_item{appearance=Appearance, manufacturer=Manufacturer, type=Type, overlap=Overlap, gender=Gender, colors=Colors}) ->
-	GenderInt = case Gender of male -> 16#1b; female -> 16#2b end,
-	<< Appearance:16, Type:4, Manufacturer:4, Overlap:8, GenderInt:8, Colors/binary, 0:40 >>;
-build_item_constants(#psu_consumable_item{max_quantity=MaxQuantity, pt_diff=PointsDiff,
-	status_effect=StatusEffect, target=Target, use_condition=UseCondition, item_effect=ItemEffect}) ->
-	<< 0:8, MaxQuantity:8, Target:8, UseCondition:8, PointsDiff:16/little, StatusEffect:8, ItemEffect:8, 0:96 >>;
-build_item_constants(#psu_parts_item{appearance=Appearance, manufacturer=Manufacturer, type=Type, overlap=Overlap, gender=Gender}) ->
-	GenderInt = case Gender of male -> 16#14; female -> 16#24 end,
-	<< Appearance:16, Type:4, Manufacturer:4, Overlap:8, GenderInt:8, 0:120 >>;
-%% @todo Handle rank properly.
-build_item_constants(#psu_striking_weapon_item{pp=PP, atp=ATP, ata=ATA, atp_req=Req, shop_element=#psu_element{type=EleType, percent=ElePercent},
-	hand=Hand, max_upgrades=MaxUpgrades, attack_label=AttackLabel}) ->
-	Rank = 4,
-	HandInt = case Hand of
-		both -> 0;
-		_ -> error
-	end,
-	<< PP:16/little, ATP:16/little, ATA:16/little, Req:16/little, 16#ffffff:24,
-		EleType:8, ElePercent:8, HandInt:8, 0:8, Rank:8, 0:8, MaxUpgrades:8, AttackLabel:8, 0:8 >>;
-build_item_constants(#psu_trap_item{max_quantity=MaxQuantity}) ->
-	<< 2:32/little, 16#ffffff:24, MaxQuantity:8, 0:96 >>;
-build_item_constants(#psu_special_item{}) ->
-	<< 0:160 >>.
diff --git a/src/psu/psu_proto.erl b/src/psu/psu_proto.erl
index f08763f..b385710 100644
--- a/src/psu/psu_proto.erl
+++ b/src/psu/psu_proto.erl
@@ -1210,7 +1210,7 @@ build_010a_list([ItemID|Tail], Acc) ->
 	UCS2Name = << << X:8, 0:8 >> || X <- Name >>,
 	NamePadding = 8 * (46 - byte_size(UCS2Name)),
 	RarityBin = Rarity - 1,
-	DataBin = psu_game:build_item_constants(Data),
+	DataBin = build_item_constants(Data),
 	BinItemID = case element(1, Data) of
 		psu_clothing_item -> %% Change the ItemID to enable all colors.
 			<< A:8, _:4, B:12, _:8 >> = << ItemID:32 >>,
@@ -1834,6 +1834,32 @@ send_1a07(#client{socket=Socket, gid=DestGID, lid=DestLID}) ->
 	packet_send(Socket, << 16#1a070300:32, DestLID:16/little, 0:144, 16#00011300:32, DestGID:32/little, 0:160,
 		16#01010101:32, 16#01010101:32, 16#01010101:32, 16#01010101:32 >>).
 
+%% Common binary building functions.
+
+build_item_constants(#psu_clothing_item{appearance=Appearance, manufacturer=Manufacturer, type=Type, overlap=Overlap, gender=Gender, colors=Colors}) ->
+	GenderInt = case Gender of male -> 16#1b; female -> 16#2b end,
+	<< Appearance:16, Type:4, Manufacturer:4, Overlap:8, GenderInt:8, Colors/binary, 0:40 >>;
+build_item_constants(#psu_consumable_item{max_quantity=MaxQuantity, pt_diff=PointsDiff,
+	status_effect=StatusEffect, target=Target, use_condition=UseCondition, item_effect=ItemEffect}) ->
+	<< 0:8, MaxQuantity:8, Target:8, UseCondition:8, PointsDiff:16/little, StatusEffect:8, ItemEffect:8, 0:96 >>;
+build_item_constants(#psu_parts_item{appearance=Appearance, manufacturer=Manufacturer, type=Type, overlap=Overlap, gender=Gender}) ->
+	GenderInt = case Gender of male -> 16#14; female -> 16#24 end,
+	<< Appearance:16, Type:4, Manufacturer:4, Overlap:8, GenderInt:8, 0:120 >>;
+%% @todo Handle rank properly.
+build_item_constants(#psu_striking_weapon_item{pp=PP, atp=ATP, ata=ATA, atp_req=Req, shop_element=#psu_element{type=EleType, percent=ElePercent},
+	hand=Hand, max_upgrades=MaxUpgrades, attack_label=AttackLabel}) ->
+	Rank = 4,
+	HandInt = case Hand of
+		both -> 0;
+		_ -> error
+	end,
+	<< PP:16/little, ATP:16/little, ATA:16/little, Req:16/little, 16#ffffff:24,
+		EleType:8, ElePercent:8, HandInt:8, 0:8, Rank:8, 0:8, MaxUpgrades:8, AttackLabel:8, 0:8 >>;
+build_item_constants(#psu_trap_item{max_quantity=MaxQuantity}) ->
+	<< 2:32/little, 16#ffffff:24, MaxQuantity:8, 0:96 >>;
+build_item_constants(#psu_special_item{}) ->
+	<< 0:160 >>.
+
 %% Utility functions.
 
 %% @doc Return the language as an atom from its integer value.