CanDo Non-Slip Vinyl Inflatable Exercise Ball, Blue, 11.8" CanDo Inflatable Exercise Balls make exercise fun and improve balance, coordination, flexibility, and strength Features a ribbed non-slip vinyl surface that gives extra grip Use as a seat to get work done at the office, or as an exercise tool to work out on at home Great for fitness enthusiasts, athletic trainers, and even pregnant women in birthing classes Latex-free material supports a 300 lb weight capacity