The only carts I've had seize up on me were the clear EZ from friction, all slotlock liners from kingpin, and had the 9rl from Elite seize up, but that was before I started switching out the silicone o-ring for a dental ligature. Smooth as butter now. I can finally do single pass lines with carts, no seizing, no bands snapping in the middle of the tattoo. I'm telling you, give those dental ligatures a try, they are designed to stretch 700% of original dia, and return to normal with only 5% loss of starting shape. I've been using the 3/16 "hard" for round groupings and 3/16 "medium" for mags.