You will need 2 feed rollers for each tray to repair a poorly feeding paper tray. If you have more than 1 tray, (optional tray 2,3 etc) you will need to buy more than 1 kit. These rollers are very simple to replace, each axle they ride on are just held into place by an axle that holds it in place. Simply remove old roller and snap new roller into place. These rollers take only minutes to replace.