Ytloospt Automatic Rebound Ab Abdominal Exercise Roller Wheel - Core Strength Trainer, Ab Workout Equipment, Gym Home Fitness Equipment, Mute Roller, Dual Wheel Design, with Knee Mat for Abs, Core Workouts FEATURES: - Made of high-quality materials, it is strong enough to withstand intense workouts and durable. The handle is filled with EVA foam, which provides a comfortable grip. - Rubber wide wheels, durable, safer and more stable. It won't damage floors and is much quieter. The wheels are 4 inches wide for more stability and increased control of your fore and aft motion without it deflecting laterally. - Self-rebound technology makes it easy to slide and helps reduce wheel wobble. Helps stretch and tone the muscles of your abs, arms, chest, shoulders and back. - Stay Entertained: Comes with a convenient mobile phone holder, allowing you to listen to your favorite tunes and stay motivated while exercising.  - Convenient to Carry: The handle is easy to remove or install, which is compact and easy to carry, perfect for home, gym and office! You can work out anytime and anywhere, make your fitness more efficient. - Best Gift: This is a great birthday gift, holiday present, or anniversary gift. Just right for friends, family, and co-workers. SPECIFICATIONS: Material: ABS, PVC, Rubber Wheel width: 10cm/4 inches Weight: 1.54Kg/3.4LB Product Size:As Picture Shown Package box size: 34.2 x 18 x 15.5cm/13.6 x 7.09 x 6.1 inch (L x W x H) PACKAGE INCLUDED:  - 1 x Abs Roller Wheel  - 1 x Knee Pad Mat