The hilmor Fin Comb 16 & 17 and or the 18 & 20 are used as the final straightening process with the SHAECO Straightening Tool.You are purchasing 2 (two) combs.hilmor Fin Combs 16 & 17, 18 & 20 FPI$20.00PriceExcluding Sales Tax | FREE SHIPPING DOMESTICQuantity*Add to Cart