Eco-bricks™ 145 Piece Natural Wooden Set: Durable, beautifully crafted, and even compatible with most of the other major interlocking block brands (so you don't have to start your whole collection all over again), the Eco-Bricks™ 145-Piece set is a brilliant alternative to plastic block construction. Benefits: Natural, Biodegradable, FSC Certified Wood Construction Blocks. 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 styles of natural blocks for endless design configuration. Natural blocks can be personalized with additional medias such as colored pencils, markers, crayons, and paint. Includes: 5 - 4 Dot Wooden Block Covers 30 - 4 Dot Wooden Blocks 90 - 8 Dot Wooden Blocks 10 - 8 Dot Wooden Covers 6 - 16 Dot Wooden Bases 4 - 16 Dot Axel with Wheels 10 Colored Pencils Packaged in a laser engraved wooden storage box.