The cole mason gourmet windsor black gloss wood pepper salt mills are made of machine cut hardened carbon steel giving superior grind performance it is designed to deliver more ground pepper in one half turn than other mills it is highly durable and is tested for durability and grind performance for 100 000 revolutions it is packed as a gift set so it can be an ideal giftmade of machine cut hardened carbon steelgreat throughputhighly durable