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Each box contains various lengths of foil-covered mineral wool insulation. For 17mm bore with a 25mm wall, there are 30 lengths. For 22mm bore with a 25mm wall, options include 30 or 25 lengths. There are 20 lengths for 35mm bore, 16 lengths for 42mm and 48mm bores, and 12 lengths for 54mm and 60mm bores, each with a 25mm wall. For 67mm and 76mm bores, there are 9 lengths, while 89mm has 6 lengths, 108mm has 5 lengths, and 114mm has 4 lengths, all with a 25mm wall thickness. Each length measures 1 meter and suits pipe sizes from 17mm to 114mm in diameter. Ensure correct size selection. For assistance, contact 01325 488588.. Rockwool Rocklap 25mm Wall x 1m Foil Faced Pipe Insulation - 27mm Mineral Wool PBR2725