The Sumo is made of S30v premium cutlery steel and measures 3/16" thick and 5.25" overall length, 58 Rockwell hardness. These have a chisel ground main bevel sharpened on both sides. Full thickness at the butt end for comfort and strength. The cool integral cord wrap technique really sets these apart and is extremely comfortable in the hand. They feature a pinky loop retainer lanyard and kydex sheath with teklok.