Product Description Protect your bowling arsenal with Vault Ball Cup Guards. These self-adhesive pads are easily applied to the hard plastic ball cups inside roller bags. A High-density foam center provides a protective cushion while a low-friction surface layer allows you to easily spin bowling balls to locate finger and thumb holes without risk of scratching. High-density EVA foam cushion.Low-friction felt surface layer.Self-adhesive.5 diameter.Available in 2 Colors: Black and Black/Orange.