Miniboard 90° Interested? Please Contact us All volumes are made of 13 layer ¾ inch (18 mm) high-quality birch plywood, and coated with our special Blocz Texture. Introducing Miniboards! The next step in the development of the volume. Miniboards are a hybrid of volumes and holds... We call them Volume Holds! They are made of wood and have no T-nuts so they are great for grabbing and screwing some Blocz screw-ons onto them.The Miniboard 90° has a right angle edge that is great for grabbing. You can pair two Miniboard 90° to form a crack. Length 23 inches Height 3.5 inches