Air soft pellets seem like they would be too big and of too little density to do the job that Dyna Beads do. I just put Dyna Beads in and they are maybe .020" dia. at the largest, and probably made of ceramic. I've talked to someone who believes Dyna Beads are just ceramic bead-blasting media and found a 50 lb. bucket for about $200. If a bunch of us go in on a bucket, that's $4 a pound (about 4-8 tires worth), vs. about $80/lb. when sold as "Dyna Beads". I'm gonna PM the dude and see if he's looked into this further.