If used as a training method in an enclosed room used safely there fine, 20,000 shots in a training session would be 10 boxes which would be around £200 for most teams, Buy 5000 reballs for £550 or so, shoot them, pick them up and clean them. Re-use and your saving money training after 3 training sessions or so. Umm, so ask Joy division and the likes of what they achieve.what do reaball actually achive,expensive,easy to loose,hurt like a bas!ard