These are real rip-stop nylon fabric chutes, so they have great strength and fantastic durability.
The DynaStar parachutes use suspension lines that are thinner compared to other brands of nylon parachutes. The advantage of this is that they pack up into a smaller bundle so you can use them in skinnier rockets, and still be assured they are loose enough to eject without plugging up the rocket body tube. Many other manufacturers use thicker string because it is easier to sew onto the canopy. DynaStar have solved this problem so thinner lines are used and they are just as strong as the bulkier ones.
At $14.25 each these parachutes are still priced lower than what most places sell the Estes 24" plastic version for. In comparison, they are spectacular to look at and will last longer. You will never want to use a plastic parachute again!