The 759-RTX replacement tips for 759-RT contains 2 tips and 4 screws. Carbofib is a PTFE based material with 30 carbon fibers added. Working temp is 249 degrees F.Specs amp; FeaturesVery Fine Points, Soft Replaceable Tips, Application: Replacement tips for 759-RT759-RTN, Quality: , Surface Resistivity : 10, Shape: Straight, Tip Angle: 51, Material: Carbon Fiber Tips, Tip Width: .012 (.3mm)