[Qualified material] -our training wheels are made of resistant and high quality materials and resistant metal supports to provide additional stability and safety to guarantee the safety of children. [Easy to install] -our training wheels are easy to Install and are equipped with several accessories, therefore, you just need to install training wheels with tripods so that your children can use the bicycle safely. Metal, plastic and high quality rubber. They are non -slip and silent, so their child can be safer and more stable when he drives without worries.