Item Type: Balance Training Foot Rocker_x000D_ Material: ABS_x000D_ Gross Weight: 370g / 13.1oz_x000D_ Product Size: Approx.9cm / 3.5in, Approx.15cm / 5.9in. Approx.9.5cm / 3.7in, Approx.12.5cm / 4.9in, Approx.26cm / 10.2in 1Arc Design: Arc design is used to fit ergonomics, improve foot posture, and stretch the soles of the feet evenly to reduce fatigue and increase flexibility. 2Striped Notch Design: This foot rocker adopts striped notch design, and the striped notch on the surface have greater friction to ensure safe use. 3Foot Massage Point: The sole of the foot is designed with a relaxing massage point, which can help the foot massage, and effectively prevent the foot from slipping during use. 4Anti Slip Stickers: Anti slip pads are installed at the bottom, which is not easy to slip and fall when the ankle achilles tendon is stretched, and it is safer. 5Strong Bearing Capacity: This calf stretcher adopts ABS composite material, which has more strong bearing capacity and guaranteed bearing upgrade.1 x_x000D_ _x000D_ AnkleStretcher