This drip line is designed for long runs and is great for large hedges, tree runs or large areas. This drip line is 13 mm and has a dripper system built into the tubing, runs of up to 150 meters can be achieved with this. This is the ideal solution for long run watering. Pressure compensation : ensures consistent flow. Two layers : black outside Crush-resistant. Dual outlet ports, eliminate the risk of back-siphoning< Opperating pressure from 1.0 to 2.5 Bar. 2 Litre/Hour drippers are located every 50cm This is sold in meters so please just order the required length in meters.