plain rubber gasket 

1.material:viton, silicone, NR, EPDM, butyl, NBR, HNBR, Neoprene, ACM, etc.
2.OEM/ODM are highly welcome
3.can make a new product according to your design
4.any size and shape can be produced.
5.packing:carton,also can be based on your requirments