My friend got pre cut tint off ebay for like 15-20 bucks and he ordered 30%. When it came in, because im super cool we measured it and it was 5% put it on real quick re measured it and it was 7%. Called the seller, swore up and down that it was 30%, called us liers and refused to refund the money.
Needless to say, ordering per cut tint is a big risk, kinda like going with DDM hids instead of VVME. Never know what your going to get.