Once the batteries are added

SIZE Inside Diameter Inside Circumference US / Canada MM INCH MM INCH 5 15

this roller wheel features thickened rubber tracks on the wheels

☆High-frequency vibration

Food-grade Material: Air fryer silicone baking tray reusable

Plank Ab Roller Wheel for Core Trainer Kitchen Once the batteries are addedFEATURES Ultimate Home Gym Equipment Ab Roller KitInnovative ab roller wheel, builds your abs faster and more efficiently, escalates your core routine exercise, engages multiple muscle groups. Use this ab roller for abs workout, get a full body fitness efficiently. Throw away heavy fat and bad mood, gain a new you quickly just few minutes per day. HIGH QUALITY MATERIAL: Made of high quality engineering plastics, simple design, beautiful appearance,