Stiff high-carbon carbon steel blades, 0.05” to 0.65” thick. Full tang blades, heat-treated, tempered, ground, mirror-polished and lacquer-sealed. Flexible taping knife blade is hollow ground on both sides. Handle made from Polypropylene. Optimum blade design, hardness and flexibility, offering reliable, durable, quality workmanship. Solvent-resistant handle.