LamsonSharp Vintage Premier 7" Santoku - Kedge The Kullenschliff edge, also known as Granton, prevents food from sticking. Super alloy American steel with 60? Rockwell for superior edge retention. Double tempered with cryogenic phase maximizes the hardness of this premier blade, resulting in a structurally stronger, more durable edge. This Vintage design has a richly-grained Morado wood handle. This exotic wood from the mahogany family is contoured with palm swell for added comfort.