... ,NR,NEOPRENE,SILICONE,FKM. (2)Customize various rubber grommet for wire. Features:(1)Material:NBR,SBR,NR,NEOPRENE,SILICONE,FKM etc.(2 ... protect or cover through holes with rough edges.The rubber grommet can shield the wire or other materials from any damage ... .The rubber grommet also adds a neat,clean look to any professional wire ...