The design of a good training foothold is subtle thing. You want flexibility of use, appropriate friction and something that teaches you how to really apply power through your feet.
Welcome to the Lattice Power-Up Buttons! They come in two sizes, small and large, and are flippable so you can decide on which size you want. The texture is “fine sand”.
22mm to 29mm, depending on orientation
Note: Non-EU customers may be liable for customs/import duties.