Patch cord with LSZH jacket, twinfiber 1.4mm, singlemode Fiber class.Mounted on both sides with LC-QR connector, IEC 61754-20 compatible, Zirconia (ceramic) ferrule with a PC polished (0°) endface geometry, connectors qualified in acc. with IEC 61753-1 for category C (controlled environment), blue connector housing (singlemode), blue unlocking clip, material PC / UL 94 V-0, blue strain relief, material PP, white plastic dust shutter.Performance :Insertion loss (IL) Grade C for 97% of the tested specimen: ≤ 0.50 dB / typical ≤ 0.25 dBReturn loss (RL) Grade 2: ≥ 45 dBMechanical specifications:Mating cycles: delta < 0.2 dB after 500 mating cyclesPull-out force patch cord: ≥ 50 N