Make their train adventures more exciting with the BRIO World – 33735 Tunnel. ? Made with FSC® certified wood. ? Easily attaches into your current BRIO train set. ? Combine with other toys in the BRIO World series for hours of creative play. ? Measures 23.4 x 8.5 x 10.7 cm. ? Suitable for ages 3 years and up. ? Conforms to the safety requirements of ASTM F963. ? CE certified.