I was given a bunch of GAPI R-12 O-rings - more than I'll ever possibly need or use. The sizes are: 30 x 3, 38 x 3, 40 x 3, 42 x 3, 32 x 3.5, 33 x 3.5 - all in sealed bags of 100 - total of 13 bags. Cover my shipping costs (figure $5) and they're all yours. First e-mail with U.S.A shipping address gets them. Brad