Transport Clip is used for the purpose of protecting the cartridge head and transporting the cartridge everywhere safely. It prevents the head of the cartridge from clogging, drying, leaking and color mixture. It does not necessitate any use of blue tape, PVC cap like cartridge head protecting methods. It protects the electronic circuit and nozzle area of the cartridge from outside effects. HP 8727/6656/8728/6657/342/343/344/336/338 Transport Clip(silicone end) Lexmark 10N16/26 - 17/27 Transport Clip(silicone end) HP 339 Transport Clip(silicone end) HP 8727/6656/336/338(Black) Transport Clip(rubber end) HP 8728/6657/342/343/344(Color) Transport Clip(rubber end) HP 51645/6615/51640 Transport Clip(black sponge) HP 6578/1823/51641/6625 Transport Clip(rubber)