... :NBR,SBR,NR,NEOPRENE,SILICON,FKM. (2)Customize various rubber grommet for wire. Features:(1)Materials:NBR,SBR,NR,NEOPRENE,SILICON,FKM ... to 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 or cable installation. Rubber Grommet