Hello, you are looking at a brand new in the package Gimar Novarossi 28-9 piston sleeve and conrod set. This fits any of the .28 Novarossi engines with the pin facing the intake and gives an immediate bump in power compared to what you currently have in your engine. Replaces the internals of a 28-8, 28-7, 28-9, or 28-5 engine for a boost in power. If you have any questions, please just ask!