New old stock, 43.5mm "65cc" Metra Kit for Derbi mopeds with the Piston Port engine.
Cast iron design with 2 ring piston makes for a reliable cylinder.
Comes with cylinder, piston, rings, pin/clips, and gasket kit.
These are vintage inventory. They may not have that brand new shine like one made today.
Some of these have dark grey pistons. Some of these have shiny silver pistons.