Ab Roller Four-Wheel Display Automatic Springback Smartphone Stand Included Knee Mat Included Load Capacity 200kg Easy Assembly Silent Professional Abdominal Machine Doesn't Scratch Home Floors Stability and Quietness The innovative four-wheel design, in conjunction with the non-slip design of the ab wheel, reduces noise. It eliminates anxiety caused by wobbling or falling during exercise, making training safe and secure. The load capacity has been increased to 200kg, suitable for people of a wider range of weights. Display Function This ab roller is equipped with a display that accurately shows the number of repetitions and time in real-time. You can grasp your exercise data, adjust the number and intensity of your training, and improve your exercise efficiency. Smartphone Stand and Knee Mat The ab roller has a built-in smartphone stand and is compatible with many smartphones. There is a soft mat on the bottom to protect your elbows. A knee mat is also included. Assembly and Support Assembly is quick, simply insert the handles into the product body. The handle length is adjustable in two stages. It doesn't take up much space, doesn't scratch the floor, and can be easily used at home.