They are bike specific and cut to shape but you can get blank sheets if you want to cut it yourself.
About £30-40 is about the going rate on ebay.
Not a bad edition to the bike if you want to reduce arm fatigue and increase grip when braking.
They are simple enough to stick on.
I've posted it on here somewhere else.
Clean the tank really well, then do it again, and again.
Heat up the stomp grips (I used the gas hob and waved them over the top) and they will get really soft and floppy but the glue goes really tacky at this point.
Line them up on your tank and work out all the air bubbles (I used a pencil between the knobblie bits).
Once you have finished, put the bike back in the shed for a minimum of 24 hours for the glue to cure.
Job done.
Just as a note though, my leathers are starting to show signs of wear inside the knees 2 years later but I do grip with my knees and brake quite hard.