The full yoga block eva foam is used for cushioning in inversions such as the shoulder stand which four blocks are required to support the head in forward bends and for lift in seated twists spacer blocks of 1 are particularly useful when needing to reduce or increase the height of ones lift by less than 2 5cm in one go available in non toxic scratch resistant first grade eva foam with 3mm chamfered edges or in recycled chip foam size of the full yoga block eva foam are 305mm x 205m