Silverline White PTFE Thread Seal TapeProvides Watertight Seal For Water-Pipe Fitting & Installation WorkHelps Prevent Bi-Metal Corrosion In Threaded JointsLubricates Threaded Joints During Assembly & Helps Prevent Bi-Metal CorrosionSuitable For Cast Iron, Steel, Alloys, Plastic, Brass & CeramicsComplies With BS 6920-1:2000 & BS 7786:2006Size: 12mm x 12m