Our Bamboo Build & Run presents kids with a world of possibilities to engineer, build and play with an infinitely configurable array of tracks, cylinders and spirals. Marbles drop, spiral and slide down your creations encouraging hours and hours of engaging playtime. Eco-friendly bamboo construction, our Jumbo Kit comes with 138 pieces and a booklet full of tips and tricks to get you started! Recommended for kids age 4 years and above. 100% carbonized bamboo for tracks; Biodegradable wood pulp for tubes; 100% recycled plastic for all connectors; 100% cotton for ropes; glass for the marbles; recycled materials for box packaging.