watch micro flat sealing gaskets for watches, rubber flat round gaskets for watch buttons and stems.
MRM7 Flat Micro O Rings Watch Flat Micro sealing Ring by Size
Micro Flat Ring Gaskets - By Size
ISO Swiss or made in Italy
Nitrile (NBR) black sealing rubber
ISO = ISO Swiss
£2.25 pack of 2
or 10 more £1.80