Strong and lightweight piston. The body is made from a high density nylon (plastic) fiber whilst the rack is made from steel using Metal Injection Molding process (MIM), very tough and durable.
The rack being glued to the body changes with each batch, if it isn't glued I recommend gluing.
The 2nd tooth has been shaved down to 1mm in height, normal teeth height are 2mm, this can help correct AOE on some gearboxes, but others may require more material to be removed.
These types of pistons are often called a High Speed piston as large sections of plastic are missing from each side to lighten the weight, hense the use of "swiss-cheese".
Weight = 14g
Length = 67.2mm
Width (rail to rail) = 21.9mm