303 STAINLESS STEEL 303 stainless steel was destined for milling. The soft yet durable metal delivers superior feel and artisan aesthetics. MACHINE MILLING Flowing lines with natural curvatures offer an exceptional look worthy of admiration at address and in your hand. If perfection were possible, it would be machine milled. PURE ROLL(TM) INSERT The soft, Surlyn insert previously used in our Spider X makes its way into the TP Collection of blades and technical mallets. Pure Roll(TM) insert features grooves at a downward 45deg angle, designed to optimize roll characteristics.