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. Color: Black.