Note (updated July 20, 2009):
It had to happen; after more than 11 years, we FINALLY stopped selling these O-Rings. I simply don't have the time anymore, and we never made money of course. We originally GAVE AWAY more than 500 of these O-Rings, and shipped them for free. This was eventually abused, and we started charging $2.50 for two, including shipping, this now also ceased., and we no longer ship any O-Rings effective immediately. I sure hope all who received the O-Rings appreciated them, and I apologize for no longer being able to send them out.

Look for a 4mm x 48mm diameter O-Ring, NITRILE/BUNA material.

Cheers, MAL