Sportsheets O-Ring 4 Pack For self-pleasure as a cock ring or for comfortable, secure attachments for your Sportsheets harness. Four sizes 1.25 inches, 1.5 inches, 1.75 inches and 2 inches. Sportsheets O-Ring 4 Pack is a registered trademark for Sportsheets. Keeping couples connected. Please note the package is changing to a black background. New image added for 2013. 2012 Sportsheets blue package.