The Tor Magnetic Boards are an excellent, compact design that are stackable up to 12cm (slightly larger than a North American 3board), they stack in 2.4cm increments. This is perfect to find just the right range of motion to target your weak point!
Magnets make the boards snap tightly together and dowels ensure they stay safely in place, when pressing heavy loads. To adjust board height, simply remove the top board or add another one on top. The magnetic design makes it easy to adjust the boards to the exact height you want.