O'Brien Black Magic KneeboardProbably the best "family" kneeboard on the market, the Black Magic does it all. The Black Magic is the best "family" kneeboard on the market. Its famous cable-actuated retractable fin system and Aquatic Hook make the Black Magic the perfect board for successfully teaching kids and beginners the finer points of deep-water starts. Its size pairs well with adults and kids alike, and its smooth bottom contouring delivers a super stable and extremely comfortable ride for all.Features: Cable-actuated retractable fins; Adjust the board's performance while riding; Integrated aquatic hook ; Make it easy to get up the first time and every time; Soft Molded EVA pad; Adjustable 3" Padded knee strap; Durable roto-molded hull; Durable, buoyant, and easy to learn on;