A new addition to our family of blocks, our 16-piece set of Mini Hollow Blocks are sized to standard unit-block construction.  Hollow shape makes them lighter and easier for little builders to work with! Beautifully constructed with birch plywood and solids. No exposed screw or hardware. UV coating. Edges are rounded and surfaces are sanded smooth for safety and hours of creative play. Blocks are sealed and finished with a UV coating. For indoor use only.