The Campus Rung from Metolius provides you with Campusboard slats in various thicknesses. Each board has a flat and an undercut surface and can be mounted as desired. It goes without saying that the woods are lightly rounded to ensure a finger-friendly grip. For efficient training.Size S- mass: 41 x 1.9 cmSize M- mass: 41 x 2.5 cmSize L- mass: 41 x 3.2 cm