THE SECRET TO PRO-EXTRA EXCELLENCE INCLUDES AN ARTFUL MIX OF THE FOLLOWING THREE PREMIUM FILAMENTS, WHICH WHEN BLENDED EXPERTLY TOGETHER PROVIDE UNMATCHABLE SUPERIOR PERFORMANCE AND HANDLING: 1. TYNEX NYLON FOR SOFTNESS AND EASE OF PAINT FLOW. 2. CHINEX FOR FASTER CLEANUP WITH SELF-FLAGGING TIP. 3. OREL POLYESTER FOR CONSISTENT STIFFNESS RETENTION.