Crimp seals with PTFE/silicone septa. silver aluminum seal (open center), seal diam. 13 mm, PTFE/silicone septum, pkg of 100 ea. silver aluminum seal, seal diam. 11 mm, red PTFE/silicone septum, pkg of 1000 ea. silver aluminum seal, size × thickness 11 mm × 1.0 mm, white PTFE/silicone septum, pkg of 100 ea.