Young creative builders ages three years and up will love playing with these durable large cardboard building blocks. Each set features large and medium building blocks in three different colors with a fun brick design for constructive and imaginative play. Large blocks measure 12" x 6" x 3" and medium blocks measure 6" x 6" x 3". Building blocks for toddlers who can enjoy playing with others to build tall towers and have fun knocking them down. The blocks are easy to assemble but require adult assistance. Blocks are made from strong corrugated board that can hold up to 150 lbs.