PDI W Hold AEG Chamber Packing (50deg)

Product
explanation.:Compact, but it has high powerï¼?br />This is new model packing of PDI.
It has two ring ribs on the outer surface, and they improve airtight.
And more, it has "W hold ledges".
Two ledges in the packing are steady of the BB's trajectory.
It made of nitrile rubber(Hs50), and has high oil resistant and abrasion resistance.
You can use it all season!