PDI rubbers have two ribs for improved air seal. The design has two nubs with a channel in between, which helps center the BB in the barrel for more consistent hop application.
From PDI:
- Compact, but it has high power
- This is the new model packing of PDI.
- It has two ring ribs on the outer surface, and they improved air tightness.
- And more, it has “W hold ledges”.
- Two ledges in the packing are steady of the BB’s trajectory.
- It is made of nitrile rubber(Hs50) and has high oil resistant and abrasion resistance.
- You can use it all season!