What can you say other than this one works better than others I've tried. Beware of gas stations that are not of the same brand. The strands they use in this kit are the perfect size and don't bind. I used a different brand of refills (cheap) and couldn't seat the plugs properly. I had to widen a hole that was too big and still had problems. Using this kit with what they supply, when you need refills, you will come back to WYNNsky and pay a little more, you will be very satisfied. Look, I have 12 miles of dirt road to my house and we probably get 10 nails a year in every tire of every car we own. These kits are easy to repair and never leak.