Suggested Retail:$40. ROKR 3D Wooden Puzzle. This Tower Coaster 3D puzzle is like a real roller coaster,after the assembly,the ball can be rolled along the track.These designs are inspired by real-life mechanisms.We believes that building these beautiful working models should be fun.4 kinds of 3D wooden coaster craft kits brings adults back to childhood,and help children enjoy a journey of exploring woodcraft construction.. 7 DAY FULL REFUND GUARANTEE ON THIS ITEM IF ANY ISSUE IS FOUND THAT WAS NOT DESCRIBED/PICTURED. 7 DAY STORAGE IS ALSO AVAILABLE. SEE NOTES TO BIDDER, IN AUCTION DETAILS, AT THE TOP OF PAGE 1 FOR MORE INFO.