Eco-Bricks‚Ñ¢ Color are naturally dyed and biodegradable wooden construction blocks. Durable, beautifully crafted, and even compatible with most major interlocking block brands (so you don't have to start your whole collection all over again). The Eco-Bricks‚Ñ¢ Color 206 piece set is a brilliant first step into healthier, greener, construction block fun! Benefits: Natural and Biodegradable FSC Certified Wood Construction Blocks Non-Toxic Water-Base Color These interlocking blocks aren't just fun - they are friendly to the planet, too! Features: Compatible with plastic blocks Encourages fine motor skills and environmental awareness Assorted natural and color style blocks for endless design configuration Natural blocks can be personalized with additional medias such as colored pencils, markers, crayons, and paint High-quality design for lasting durability Recommended Age 4 Includes: 40 - 4 Dot Color & Natural Wooden Blocks 150 - 8 Dot Color & Natural Wooden Blocks 10 - 16 Dot Wooden Bases 6 - 16 Dot Axel with Wheels Packaged in a laser engraved wooden storage box. WARNING: CHOKING HAZARD - Small parts. Not intended for children under 3 years. Our mission at Once-Kids is to make toys that kids make their own while helping save our world's oceans.