Roo Crew Stacking Rainbow Set includes 7 colorful arcs! Perfect as an interactive toy, a gift, or cute room décor! Encourages fine motor skills.Develops problem-solving skills Build color recognition! 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.