Owlix ® Ab Coster-Hack Squat Nylon Pulley Size (3.25x2)inch with 25mm Hole 4 Pc Weight Lifting Bar  (White, Silver)

For those who don't know how do ab wheels work, it is a piece of equipment like a wheel with Heavy Roller to the side of the wheel. These Roller as they roll outwards while you perform crunches or situps. You can even use it while you stand and perform ab exercises.