... certificate: ROHS. 2. Materials: NBR, NR, FPM...etc 3. Use for all machines,size:50-630 O RING MATERIAL SR:good resilience ... ,Machine, Armarium,Toy etc10.Lead time of goods:1-2weeks for 10000pcs.11.Package:Standard export packing:PVC bag,Carton,Pallet12 ... (ODMax 1700mm) and V-ring(ODMax 1850mm). We can provide all o-rings as long as you need. Welcome your inquiry ...