I've seen my mate doing window tints, he did my Audi and used half as much film again to what he needed...one window picked up contamination (dust attracted by static when you peel the backing off) one window had been cut off the roll the wrong way and wouldnt stretch in the right direction (Window tint has a 'grain' and if you dont know how it has come off the roll, you dont know whether it's going to stretch correctly for the window its cut for) and the last window he did, there was a nick in the film and when he ran his card over it to get the water out the nick caught and it tore a huge hole in the tint. So, I wouldnt entertain it as a pre cut set as you will ALWAYS need at least one more piece on Every job you do. Its very time consuming and if you are in the least bit impatient you WILL mess it up. I have been quoted £120 to do all 5 windows on my Supra by 2 professional tinters, for the money.....it's a bargain!!!