I purchased both the roller/belt/pulley kit and the felt kit. When I took the top of the dryer it looked as though it was the felt, but knowing that I would have to take the machine apart to replace the felt, I also replaced the rollers/belt and pulley. The machine is 14 years old but otherwise runs well so believed this was worthwhile. I used the following instruction video: https://www.appliancepartspros.com/whirlpool-dryer-repair-kit-4392067-ap3109602.html