Caps, Screw Top, with Natural Silicone Rubber / White PTFE Septa, bonded in "knurled", polypropylene, Blue Caps. For use with 9-425 thread, 12x32mm autosampler vials. MicroSolv Brand. 100/PK.
Natural Silicone Rubber is made without adding color and has the same properties as White Silicone Rubber and is a less expensive bonded Septa and Cap.