Air Arms Breech O Rings x 2
These are replacement breech seals/O rings for the S400, S410, S510, Ultimate Sporter, HFT500 etc. They are fitted into the breach end of the barrel, to create a seal around the pellet probe.
Handy for when you get air blowing out the breech when you fire your rifle. It is also a good idea to keep spares in your gun bag in case one fails in the field.
They are black nitrile (rubber) O rings similar to the standard AA version.
This is for 2 x O rings.
The picture is a generic picture of some O rings, not the actual O rings you are buying.