The 505 Salt Pepper Mill Set is an acrylic salt and pepper mill set from the Cole Mason brand. The mills are made of transparent acrylic with the Cole Mason logo on the bottom. Cole & Mason produces one of the best salt and pepper mills and has a lifetime guarantee on their milling mechanism.The 505 model from Cole & Mason is their most classic mill and has been popular for over 50 years. The world's first acrylic spice grinder was launched in 1975 by Cole Mason and has been a classic at dining tables around the world ever since.