We are looking for NSF certified EPDM 70 O-rings. Here are the sizes that we are looking for; I.D CS13mm x 2.4mm13mm x 2.5mm11.8mm x 2.4mm9.8mm x 2.4mmPlease note that the material must be NSF 61 certified EPDM70. If possible, can you send us the manufacture spec as well? Can you give us the price break for 1,000, 2,500 & 5,000 pieces for each size? Can we get 6 samples of each size to test and please let us know when the samples will be available? Please let us know if you should have any questions. Thank you.