PROFESSIONAL QUALITY 407 PIECES... FAIR DEAL SHIPPING... Every 0-ring you're ever likely to need 32 sizes 407 pcs. Material buna-n passed ASTM oil #1 & #3 laboratory test d-2000 sae j200. Buna-n bg 715 (nitrile 70 shore)... Comes in handy case with each 0 ring labled...
