As with all our vinyl decals, we use 3M 2080 vinyl; this is the best on the market, and conforms well to complex shapes. As some of the pieces are quite fiddly to install, we provide two full sets. One set is fully weeded, so it's ready to install. The backup set is not weeded, meaning that you simply peel off the piece(s) you need.
Aside from the vinyl, you'll also get some wipes and and a soft squeegee in the kit.
We've taken a lot of time designing this kit, and all the button decals are over-sized, which allows them to fully wrap the buttons; this prevents the vinyl coming up at the edges on frequently-used switches (this is why we prototype for months!).