Loose Tube Internal/External Grade Fibre Monomode OS2. 9/125?m. LSOH (Low Smoke Zero Halogen). Flame retardant in accordance with EN 60332-1-2. CPR compliant to Eca. Euroclass Cca-s1a-d0-a1. G.652.D compliant low water peak grade and offers OS2 performance and OS1 backwards compatibility. Outer diameter approx.: 6.5 mm. Number of Cores: 4. Number of fibres per tube: 4 (colour coded). Black. Sequentially metre marked. Price per meter.