This is an Avast PVC electrical insulation tape in white, 18 mm wide by 20 m long with a 180 micron (0.18 mm) thick film. PVC insulation tape is the everyday consumable for insulating and protecting cable joints and repairs, bundling and tidying wiring looms, sealing the ends of cable runs and colour-coding conductors or cable lengths. White is particularly useful for identification because it can be written on with a permanent marker, so crews use it to label channels, circuits, cable lengths and equipment in racks and on stage, as well as to colour-code a particular loom. The flexible PVC backing stretches to conform around irregular shapes such as connectors and splices, and the tape can be torn by hand without tools. The roll is a standard 18 mm x 20 m size that fits common tape dispensers and tool pouches. Avast lists a matching black version separately. Detailed adhesion, temperature and voltage ratings were not published in the sources checked, so confirm them with the supplier if a specific rating is required for your application.