The first decision that you need to make when purchasing scooter pegs is whether you want light weight or durable pegs.  You can't get both.  Aluminum pegs are very light but not very durable and won't last nearly as long as steel scooter pegs if you do any amount of grinding.  If you have a very light setup, you may want to stick with aluminum scooter pegs to keep your scooter weight down.