Syntox has all the benefits of Ox hair brushes without any of the negatives. It is 20% softer than our Ox with the durability of DuPont’s SRT synthetic filaments for a superior finish. Syntox is totally shed resistant and will last at least 5 times longer than Ox Hair brushes. Even more importantly, the new Syntox can be used in water or solvent based clear finishes. And it’s less costly! Natural Hardwood Flat (Thin) Style Handle. Stainless Steel Round Edge Ferrule. Extra Soft Brush.