Training Wheels are made of heavy duty PVC only and stabilizers are constructed of heavy duty PVC enclosed in 420-denier nylon covers.Are you new to paddle boarding or do you have kids who are interested in picking up the sport KWIK TEK has created training wheels that mesh perfectly with any inflatable SUP board. This allows the rider to get adjusted to being out on the water while on their paddle board without worrying about falling when they lose their balance. You can attach any of our inflatable paddle boards to our Airhead SUP Training Wheels to get started paddle boarding!Convert any SUP to a stable platform for fishing, yoga or bringing a dog or child alongGreat for beginners, rough water & plus size paddlersDurable PVC constructionInflate/Deflate in seconds with patented Speed Safety Valves