Prophy Cup Snap-on 4-Webbed Blue PC-320, 100/box

These snap on my tooth polisher and work great. I bought one of those cheapie whitening kits that came with four cups and nothing else. But I will say the little motorized polisher is powerful. Unfortunately, it also means that those little cups fly off and into the toilet sometimes. These fit perfectly, dont fall off as badly and were so in-expensive...I don't care if one goes flying now and then.