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Lengths per box are 42 for 17mm Bore with 20mm Wall, 36 for 22mm Bore with 20mm Wall, 30 for 28mm Bore with 20mm Wall, 25 for 34mm Bore with 20mm Wall, 20 for 42mm Bore with 20mm Wall, 16 for 48mm Bore with 20mm Wall, 16 for 54mm Bore with 20mm Wall, and 12 for 60mm Bore with 20mm Wall. Insulation material is Mineral Wool, foil-covered, with a thickness of 20mm and a length of 1 metre. Suitable for pipe sizes from 17mm to 60mm diameter. Check order size carefully. For assistance, call 01325 488588.. Rockwool Rocklap 20mm Wall x 1m Foil Faced Pipe Insulation - 54mm Mineral Wool PBR5420