[Qualified Material]-Our training wheels are made of high quality sturdy materials and strong metal brackets to provide extra stability and safety to ensure children's safety. [Easy to install] - Our training wheels are easy to install and come with various accessories. Therefore, you only need to install the training wheels with tripods to let your children use the bike in safely. [Non-slip and quiet] - Our bicycle auxiliary wheels are made of high quality metal, plastic and rubber. They are non-slip and quiet, so your child can be safer and more stable when riding without worry. [Application] -This auxiliary wheel is adjustable, suitable for bicycles from inch to inch. You can adjust the size to make it more suitable for your child's bike.