3 years & up. Combine the creativity inherent in block play and gross-motor energy with Outdoor Hollow Blocks. Made of FSC certified eucalyptus wood, the framed blocks and flat boards in varying sizes allow for substantial, interactive group builds during outdoor play. Blocks feature smooth-sanded edges and surfaces and durable construction meant to withstand rugged, outdoor play. Follow care instructions included for proper maintenance. Store in a dry, shaded area.