Water Sports
Adjustable Distance Balance Surfboard - Indoor & Outdoor Surfing Trainer, 300lbs Capacity, Non-Slip Safety (Black)
Adjustable Stopper Design: Equipped with 2 detachable stoppers, users can easily adjust the balance board's distance according to their skill level and needs, offering 11, 16, and 22-inch options to meet the challenges of different users....
https://www.bizrate.co.uk/water-sports/adjustable-distance-balance-surfboard-indoor-oid40358416787.html