The 179D-RTX replacement tips for 179D-RT contains 2 tips and 4 screws. Tips are made from Copolymer which is static dissipative (10 - 10 ohmssq), cleanroom safe, SiliconeChloride free and temperature resistant to 90 C (195 F).Specs amp; FeaturesSoft Replaceable TipsApplication: Replacement tips for 179D-RT and 179DN-RT, Quality: , Surface Resistivity : 10-10 ohmssq, Shape: Straight, Material: Copolymer Tips, Tip Width: .06 (1.5mm), Tip Height: .25 (6.25mm)