Made of ABS and PP material, durable and reliable, wear resistant. Four wheels with rebound, fitness is easier. The gear driven spring design provides a truly smooth and comfortable experience. Turtle shell outer cover protection, safer, suitable for beginners. Precision gear drive, truly silent, comfortable and smooth operation. Suitable for any location such as home and gym. Made of ABS and PP material, durable and reliable, wear resistant. Can be use anywhere, home or gym, etc., convenient for your exercise Easy to use, simple forward and backwards motion, no complex learning to use this. No damage to the floor, mute rolling, you can use it on yoga mat. A great item to help shape and tone your upper body (abdomen/chest/back/shoulders/arms). Specifications: Material: ABS, PP Color: blue Size:about 40x16cm(L x H) Package included: 1pc x abdominal roller