SLAM WALLBALL 10LB EVWL7R010 Size:N A heavy duty vinyl coated nylon Size:38 12 heavy duty vinyl coated nylon construction design holds its shape over time and allows you to strike balls with arms and legs for more diverse training Utilize the dumbbells on any weight bench or with a variety of other exercise equipment for home use to expand workout possibilities even more core exercises of many types and dynamic strength training all while the ball remains dimensionally stable and balanced and moisture and scuff resistant heavy duty vinyl coated nylon construction design holds its shape over time and allows you to strike balls with arms and legs for more diverse training