Fance Wireless Earbuds,Bluetooth Earburds Stereo, Wireless Earphones with Mic Mini in-Ear Earbuds Earphones Earpiece Sweatproof Sports Earbuds with Charging Case Compatible iOS Android Smartphones A fun and challenging 3D puzzle of The Cologne Cathedral in Cologne Constructed using CubicFun's unique slotting system Difficulty Level: 5 stars ; Number of Pieces: 179 Construction time: 200 to 220 minutes Length when completed: 35cm