This is the official keychain from Amsterdam's long-established Smart Shop, Number One. The mushroom design is cute. The back is completely flat. This is the latest keychain and wasn't available before. I remember buying and importing 20kg of mushrooms from this smart shop in the past. It's the shop on the right corner, entering to the left from Dam Square. It's made of metal, but it's not plated, so it won't peel off. I believe it's pewter. It's also being sold on other sites, so if it's sold out, please allow me to cancel. Thank you.