12 months & up. The Jumbo Linking Cubes Manipulative Set is the ideal early STEM toy! This set of 48 cubes feature grooves and ridges that easily slide and link together to form imaginative structures. Cubes can link horizontally, or vertically in endless combinations. Little ones will explore color and shape recognition, spatial relations and early engineering concepts. Sized perfectly for little hands, cubes are made of durable, safe plastic and feature rounded edges. Linking Cubes come in 6 bright, appealing colors in a stackable plastic storage container with locking lid. Cubes measure 2" x 2".