Set includes 16 larger sized plastic cubes with silk screened red, yellow and/or blue triangles or squares on all 6 sides. Twelve pattern cards show designs in 2 or 3 dimensional representations, some with individual block outlines and some without. Or, make up your own simple to complex designs. All stores in plastic tray with lid. Great for developing spatial awareness, visual perception and attention to detail. Work on in-hand manipulation skills by challenging players to rotate blocks held in only one hand, no help from support services.