SAFE: Your kid's safety is 1st priority. We developed the one piece strong training handle which is made of heavy duty Cro-Mo steel (NOT welded) . We understand there is great leverage when the bicycle falling. The bar could handle that situation easily. <br/>COMPATIBILITY: Compatible with round seatpost diameter: 25.4mm to 28.6mm. Warning: Please make sure that seatpost is securely sitting in the seat tube, before installing the balance handle.<br/>GRIP: Every soft comfortable non slippery grip. <br/>EASY TO USE: Perfect accessory to train children how to ride. A friendly reminder: please wear a kids helmet when riding.<br/>