Take the time to make sure you are placing the stickers on the correct key.

Be sure to clean the keys before hand or it's pretty much guaranteed you'll see a speck of dust or three after you've adhered the stickers to the keys.

At the other end of the keyboard is the lowest A which has both the flat and sharp keys (black keys) denoted which is just like all of the other A keys however there is no A flat key to the left as

Also, for some reason the free e-book didn't come through to my email but I emailed the sellers and it was sent right away