brand new gtx cartridge pen 1.motor: japan motor,it is more power. 2.new system: could open the pen,to change storke part and spring if damage 3.with extra items: with 1pc 30mm tube+1 box tool kit+1 rca cord+1 pen holder 4. long grip advantage:  artist could adjust needle length even if they wire the grip cover. 5.color:red/blue/purple/gun-grey