The 159C-RTWX replacement tips for 159C-RTW contain 2 tips and 4 screws. Acetal has outstanding resistance to chemicals and solvents. It is excellent for cleanroom use.Specs amp; FeaturesWide Points, Soft Replaceable Tips, Application: Replacement tips for 159C-RTW, Quality: , Surface Resistivity : Insulative, Shape: Straight, Material: Acetal, Tip Width: .08 (.2mm)