... certificate: ROHS. 2. Materials: NBR, NR, FPM...etc 3. Use for all machines,size:50-630 O RING1.Product/Service(We Sell ... package: 5000 pcs/bag, 10000pcs/bag, or customized7. QC/ QA : The third parties8. Property : Excellent resistant to ozon, oxygen, mineral, oil ... products, as well as vehicle andmotorcycle fittings.10. Note: a.Models and Logos can be Customized according to your Requirementb.Designs ...