Palsonite - Hard surface treatment to make steel surface more resistant against corrosion and wear, and reduces friction. There is no other airsoft manufacturer use this high level technology process on cylinder production, but PDI did it for high end airsfters.

Features a high precision laser-cut and cold-hammered cylinder and a tapered cylinder head
Suitable for Ares AW338 / MS338 Series Airsoft Rifle
Hard Piston Design for better airtight and offer higher velocity
1/100mm tolerance for utmost smoothness and power
Maximum possible power potential on your Rifle
Note that the tolerance level and precision of these parts far surpasses most parts on the market, so they are the choice for professional and serious tuners in Japan

Include:
Precision Palsonite Cylinder.
Tapered Cylinder Head +.
HD Piston.
Spring Guide for HD Piston. |
(Please use a fat spring as used on SPR, SS, VSR series (Spring Not Included). )

Genuine Products by PDI (JAPAN)

The body & The head: Made of Duralmin.
The Ring: Derlin
The End: Stainless Steel