Purdy uses the highest quality solid, round and tapered (SRT) filaments from DuPont in the softest brush offering. Syntox brushes outlast Ox-Hair filaments and create an ultra-smooth finish on any surface. Plus, these brushes work great with both water and solvent-based clear finishes. Syntox has all the benefits of Ox hairbrushes without any of the negativesIt is 20% softer with the durability of DuPont's SRT synthetic filaments for a superior finishTotally shed resistant and will last at least 5 times longer than Ox hair brushesCan be used in water or solvent based clear finishesAlderwood handle for balance and comfortHandmadeFlat2"