Oversized hollow blocks for giant creations! This 16-piece set is constructed of birch plywood and solids. Edges are rounded and surfaces are sanded smooth for safety and hours of creative play. Blocks are sealed and finished inside and out. For indoor use only. Ages 3+ . Largest block measures: 15.5″W x 8″D x 4″H. Smallest block measures: 4″W x 8″D x 4″H Over-sized open-ended hollow building blocks Set includes 16 pieces Children can easily hold onto the open sides Rounded edges and sanded smooth surfaces Use them on their own or enhance block play by combining with sets of unit blocks For indoors use only Material: Birch plywood and solids, sealed and finished with a UV coating Educational Focus: Spatial reasoning, problem solving, mathematical skills and collaborative negotiation Suggested Age: 3+ UK ONLY - DIRECT DELIVERY This item is not available to buy using the Tinker Tray Play payment plan.