DURABLE HIGH-QUALITY CERAMICS ENSURE LONGEVITY – The Butter Bell crocks are made from a proprietary, high-grade ceramic mixture called New Bone China. When fired at 2200 degrees, our unique glazes create a beautiful, scratch resistant finish. The crocks contain NO lead or cadmium and are backed by a 2-year limited warranty. The Original Butter Bell crock by L. Tremain is a modern version of the centuries old French "beurrier", the Butter Bell crock keeps butter fresh and spreadable without refrigeration, spoilage or odors. By adding its own improvements and design features, the L. Tremain company has popularized this natural method of preserving the creamy texture and delicate flavor that makes butter the most desirable and most used spread in the world. Since its inception in 1995, the Original Butter Bell crock has become the most respected and recognizable brand of butter crocks globally. We're proud to say we've made butter lovers happy for over a quarter century!