Features: 1.Using the rebound principle of the spring, the two wheels push forward and the spring stretches to generate elastic force. 2.The handle is made of foam material, which has the effect of moisture absorption, so as to avoid problems such as slippery hands caused by sweating in the palm of the hand. 3.The cover is made of silver ash supporting bone plastic material (propylene), which is beautiful in appearance. 4. Metal frame, safe and reliable. 5. The wheels are made of (ABS) Rubber plastic material, which is durable.