I don't recommend them.
I bought some at Hobby Lobby in Aug. It got stuck in my printer (I guess because of the heat a laser printer puts out). Luckily my DH was able to umscrew the plastic panel & I peeled it off with no damage to the machine.
So I took the package to Staples & asked if they could run it in their color copier. They did. It looked great, but when I ironed them on the t-shirts the images were very faded & fuzzy looking.
I followed the directions on the package very precisely.