Emily Pets Presents SIZING INFORMATION: Red&White : Stretch length 17’’, Ball diameter 3.2’’, Suction cup width 3.7’’, suitable for most dogs of all breeds. Blue&Red : Stretch length 17’’, Ball diameter 3.2’’, Suction cup width 3.7’’, suitable for most dogs of all breeds. Green : Stretch length 18.1’’, Ball width 4.5’’, Suction cup width 3.7’’, suitable for most dogs of all breeds. Blue : Stretch length 18.1’’, Ball width 4.5’’, Suction cup width 3.7’’, suitable for most dogs of all breeds.