Gamegenic Catan Hexatower Red: - Rules of Play says:

The Hexatower is a premium dice tower in the famous hexagonal shape of Catan® It has an innovative Nexofyber surface and a soft, silver fabric inner lining. The premium materials ensure a comfortable touch-and-feel experience and dice-rolling is enhanced by a pleasant sound. The surrounding flap, held safely closed by strong magnets, can be removed and sticks to the side of the Hexatower to create a dice-stopper at the gaming table. Of course, this luxe accessory can also carry your Catan® dice.