Mill set OSLO 18.5 cm clear from Cole & Mason is made of acrylic and stainless steel. This elegant set includes both a salt and pepper mill, equipped with a hardened carbon steel mechanism for pepper and a diamond-sharpened ceramic mechanism for salt. The mills feature a spring-loaded mechanism that makes it easy to adjust the grind size from fine to coarse. They come filled and are presented in a stylish packaging, with a lifetime guarantee on the mechanism.