These Stand Up Paddleboard Training Wheels are made of heavy duty PVC, and the stabilizers are constructed of heavy duty PVC enclosed in 420 denier nylon covers. Perfect for beginner stand up paddleboard riders, these SUP training wheels are an essential paddleboard accessory that make it easy and fun to start on the water.These Stand Up Paddleboard training wheels mesh perfectly with any inflatable Stand Up Paddleboard. This helps the rider adjust to being out on the water without worrying about falling.