Eco-friendly: Our toys are made from Eco Wood 2.0, a unique blend of plastic made from over 90% recycled materials that include plant fibers, recycled plastic, and resin. The distinctive specks in the blocks are bits of plant fiber used especially to make Roo Crew toys..5th bullet text . With Roo Crew's Bag of Construction Blocks, the construction play possibilities are endless! Your little one will have a blast building tall towers and structures. These oversized blocks are easy to stack and are perfect for early childhood play and development.The reinforced, recycled storage bag with a twine handle makes cleanup a breeze! Blocks can be easily stored in the bag after playtime. 50 eco-friendly construction blocks .Blocks compatible with all other Roo Crew building toys and all major block brands