The Cylinder Blocks is a classic piece of Montessori material, and this set is simply a smaller version of it.  As in the regular set, the mini set includes four blocks with pieces that vary in height and/or diameter, but the mini set has only five pieces in each block where the regular set has ten.  Made of clear basswood with a satin-touch finish, each block measures 16 x 4 x 5 cm.  Not recommended for children under 3 due to choking hazard from small pieces.