Description: 【Enhanced Durability and Quiet Operate】: This ab wheel roller features a multi layered material design that ensures double the silence and increased wear resistance, providing a comfortable and workout environment 【Smart Brake and Rebound System】: Equipped with an intelligent braking mechanism, this ab wheel automatically rebound when pushed to its limit, ensuring a secure and more stable exercise experience 【Comprehensive Core Exercise】: The abdominal Roller Wheel is designed to effectively exercise your abdominal muscles, core muscles, arms, and shoulders, and strengthen overall muscles 【Ergonomic Comfort Grip】: The nonslip handle design of Workout Equipment provides a comfortable grip and improves training efficiency 【Sturdy Structure】: Exercise Single Wheel is made of ABS Rubber Steel, sturdy, and wear resistant material. The lightweight design is easy to store and carry, convenient for fitness outside Specification: Material: ABS Rubber Steel Size Chart: M: wheel 9.8cmx12.5cm/3.86inchx4.92inch L: wheel 12.7cmx15.5cm/5.00inchx6.10inch Package Includes: 1 Ab Wheel Roller Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.