The Mondo Bloxx 40 Pack assorted set includes 10 large 12x6x3, 14 medium 6x6x3, and 16 small 6x3x3 bricks. This combination has the most variety of bigger bricks of any 40 pack set on Amazon, compare and see the difference! The combination will supply hours of imaginative play and endless possibilities. The simple design will teach colors, math and dexterity. 100% manufactured in the USA and made to last. Stack them up, knock them down!