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Lengths per box: 17mm Bore 25mm Wall - 30, 22mm Bore 25mm Wall - 30, 22mm Bore 25mm Wall - 25, 35mm Bore 25mm Wall - 20, 42mm Bore 25mm Wall - 16, 48mm Bore 25mm Wall - 16, 54mm Bore 25mm Wall - 12, 60mm Bore 25mm Wall - 12, 67mm Bore 25mm Wall - 9, 76mm Bore 25mm Wall - 9, 89mm Bore 25mm Wall - 6, 108mm Bore 25mm Wall - 5, 114mm Bore 25mm Wall - 4. Insulation Material: Mineral Wool, Foil Covered. Insulation Thickness: 25 mm. Length: 1 metre. Suitable for Pipe Size: 17mm to 114mm Diameter. Please check your order is the correct size. For assistance, call 01325 488588.. Rockwool Rocklap 25mm Wall x 1m Foil Faced Pipe Insulation - 42mm Mineral Wool PBR4225