The Toro Blue Stripe 1/2 in. x 500 ft. Drip Tubing is manufactured via a patented process with a 3-layer construction consisting of two strong outer layers and a muscular, flexible inner core. It is UV resistant and has been consistently tested in agriculture and greenhouse applications.
The blue striipe drip hose is the best one out there. My last batch was 6,000 feet and it lasted 15 years of use in a citrus orchard in California. The plain black stuff is inferior and bursts at the seam in under five years.