ALCONITE Ring - Fuji's engineers thought long and hard on how to make aguide lighter and stronger yet keep the cost down. After years of research they came up with Alconite, a special type of ceramic that offers strength, lightness, and durability. In fact Alconite offers 80% greater compression strength and is 20% lighter than Aluminum Oxide. Also, through Fuji's Diamond Polishing, Alconite boasts afinish that is smoother than that of Hardloy®. Fuji engineers were also able to make Alconite the thinnest and lightest ceramic ring available today; even 7% lighter than standard SiC Rings! When combined with the lightweight Concept frame the results are unparalleled ... 35% lighter and up to 50% stronger than ordinary guides.