Building Blocks: Set of 10 curved blocks for toddlers and kids in a bedroom, playroom, or classroom; includes four easy-to-grip sizes to encourage hand-eye coordination and motor development Endless Configurations: Parents, educators and caretakers can set up a creative space for imaginative play where children can build bridges, train tunnels, marble runs, and more Durable Finish: Designed with a multi-step process highlighting the natural features and grain of the wood making each piece truly unique; designed to withstand daily wear and tear Certified Safe: Wood blocks for kids are UL GREENGUARD Gold Certified for low VOCs and CPSIA compliant; features rounded edges and smooth surfaces for safety Product Dimensions: X-Large 11” W x 11" D x 5.5” H, Large 11” W x 5.5" D x 5.5” H, Medium 11” W x 3.75" D x 5.5” H, Small 11” W x 2.25" D x 5.5” H; Adult Active Engaged & Direct Supervision Required