Natural wood color barrel connectors, spools, caps and pulleys are all made of select hardwood with a safe non-toxic finish. Colorful connector rods also made of select hardwood with a safe non-toxic finish. Durable plastic, triangle fan blades. Similar to the classic Tinkertoys, but these pieces are slightly bigger. This classic construction toy is excellent for stimulating creativity and basic building techniques. No directions needed! Just use your imagination to create endless building possibilities.