Protects against very high voltages.Fine fluted slip resistant rubber.Colour coded tape on reverse of matting depicts its classification.Supplied in 1m widths, and 3 thicknesses:3mm - Class 0, tested to 10kV, 1kV working voltage.4mm - Class 2, tested to 30kV, 17kV working voltage.5mm - Class 4, tested to 50kV, 36kV working voltage.10m rolls, or cut to length in multiples of 1m.