Set of 3 Fitterfirst balance boards will challenge users of all skill levels, spanning from beginner to intermediate to advanced. Set features a 20" Rocker Board, and 20" & 16" Wobble Boards. Great for motor skills development or rehab progression. Includes wooden rack with slots to store up to 5 boards. 20" Rocker Board (square) = Beginner, Single Plane 14 degrees 20" Wobble Board (round) = Intermediate Tri-Level 10 degrees, 12 degrees, 15 degrees 16" Wobble Board (round) = Advanced Tri-Level 15 degrees, 17 degrees, 20 degrees