Use with Resin Rockers UV Resin Skim Coat Formula. 12 pack of Sublimation interchangeable chambers only! This is NOT the entire pen. These are just the chambers so you can use these if you damage the original chamber on the pen OR if your customers want additional designs for their existing pens. Have fun with these additional chambers and let your customers have a different pen for every season. These chambers can also be used for sublimation!