Wooden Balance Board Trainer with Ajustable Stoppers independent - Balance Boards for Adults and Kids, Challenging Stealth Core Trainer. Package Include: 1 * Wooden Deck ( 29.1" X 10.8" Non-Slip Deck ) ; 1* PVC Roller ( 21.4" X 3.9" Roller ) . In this balancing boards, the fulcrum (a cylinder) isn't constrained by the board ( except by their friction ), that makes them much more challenging for the rider than a rocker board is. Use Anywhere: The roller with a soft fabric on the outside, very friendly for indoor use, it could reduce damage to smooth floor tiles and wooden floors, but still is durable enough to use on outside [ If the felt on the roller gets dirty with dust, you can just clean it with tape]. FOR BALANCE BOARD TRAINER: The Balance Board Training is a fun and challenging way to improve your balance and body control for skateboarding, snowboarding, skimboarding, surfing, wakeboarding, stand up paddle boarding, long boarding and more. Simulate any boarding activity wherever you are, any time. Good weather not required. FOR FITNESS: Greatly strengthen core muscle groups (stomach & waist) as well as legs (thighs, hamstrings, hip, butt) and overall stability. This will help me with keeping the balance and strength up for board sports and hopefully make work day more interesting. FOR ATHLETICS: A great way to improve your balance and stability for athletics like Hockey, Golf, Baseball, Tennis, Martial Arts, Dance, Gymnastics and many more. It is a device that has come to be used for training in sports and martial arts, for physical fitness and for non-athletic purposes. Suitable for Anyone 3 and above