uxcell Silicone O-Rings 4-9.5mm OD, 1-6.5mm Inner Diameter, 1.5mm Width, Seal Gasket Red 50Pcs

Red o rings sized perfect fit. Good seal too.

Used to replace O rings in my Breville Oracle Touch BES990 coffee machine... Perfect size.

These didn't end up working out for what I had originally intended, but otherwise they're fine. Found they frayed and broke apart a bit easier than I would have liked, but that could just come down to the type of material.

i dont know anything about o ring i only brought this to mod my keyboard and it works prety good

Tear easy but the size is right on.. Used for coleman camp stove gas valve, but they work and 50 for 6 bucks is OK..