Eco-Bricks™ 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™ Color 54 piece set is a brilliant first step into healthier, greener, construction block fun! Benefits: Natural, 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. Includes: 10 - 4 Dot Color & Natural Wooden Blocks 35 - 8 Dot Color & Natural Wooden Blocks 5 - 16 Dot Wooden Bases 4 - 16 Dot Axel with Wheels Laser engraved storage