100-piece Unit Rocks setBuilding is a blast with our 100 piece Unit Rocks set. Castles and forts resemble real structures thanks to our Unit Rocks unique design. Perfect to handle, each piece is built to the same size and standard of our traditional bricks, made from solid wood, with hand carved grooves and finished in all organic dye. Every Unit Rock is hand finished giving a unique antique feel of stones that have weathered a long history. Truly a gorgeous educational toy.