We have NBR o ring kit of (30 sizes, total 382pcs, AS568 standard) , model no: 5A (30sizes, total 382pcs, JIS B 2401 standard) ,model no:5B (30 sizes, total 386pcs, JIS B 2401 standard), model no: 5C (32 sizes, total 407pcs, AS568 standard), model no:8B (32 sizes, total 419pcs, JIS B 2401 standard), model no: 8C