I was watching mythbusters tonight while doing some housework. In this episode, the team was testing shattered glass. It turned out the deadliest propelled shards were from tempered glass, as used in car windows. Tempered glass breaks apart into ~1cm rectangular shards and apparently cuts like razorblades when propelled. I wonder what the effects would be if shot from a slingshot? I think it would wear through a leather, cloth, or duct tape pouch pretty quick, so perhaps a pouch cut from a kevlar cut-proof glove? And of course goggles and stout leather gloves for the shooter. Since it's fairly light, thin Chinese tubes or some of the lighter theraband, perhaps? Strictly for the zombies, of course!