We continue to maintain our high standards of quality by bringing you precision-made, selected straight-grained, kiln dried, hardwood blocks. These carefully sanded, beveled edge blocks carry our Guarantee: if any block breaks or splinters in normal use, we will replace it free. The unit block is a standard 1-3/8" x 2-3/4" x 5-1/2" size; all others are multiples or divisions of this size. Augment your Unit Block Sets (or your own exisiting sets) with any of these additional pieces and shapes. Unit Arch & Circle and ½" Arch/Buttress come with 2 parts that count as 1 piece. Ages 2 years +.