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.Details:Brown hollow blocksIncludes assorted sizesSet includes 16 piecesBirch plywood and solids, sealed and finished with a UV coatingEducational focus: spatial reasoning, problem solving, mathematical skills and collaborative negotiationChildren can easily hold onto the open sidesRounded edges and sanded smooth surfacesSuitable for indoors use onlyFor ages 3 and upSize information:Largest block measures: 15.5"x 8"x 4"Smallest block measures: 4" x 8" x 4"