This Anti Tippers with Wheels will prevent your wheelchair from tipping backwards. These should only be used with Drive Medical 12" and 14" Viper, Winnie II, Infinity, Cirrus IV "ADJ Arm" Series. Anti-Tipper with Wheels|Black|For Use with 12" and 14" Viper, Winnie II, Infinity, Cirrus IV "ADJ Arm" Series and Super Hemi Kit (Item #STDSSHK)|Easy to install