This is my favorite filler for my footbags. It is 409 stainless steel. It is magnetic and has a good resistance to corrosion and of course non-toxic. This stuff is MUCH better than steel filler and is a little heavier than steel, and safer than lead. The particles are in the range of 2mm in diameter, as you can see in the pic, some are a little smaller. They are flat little disks that are around 1mm thick. I threw a BB gun BB in the pile for a size comparison.
Most people mix seed beads or plastic pellets or something with there lead or tungsten to get the fill amount with the weight they want. With this filler all you have to do is fill it to the weight you want and that is usually the fill amount you want. When I use this filler in a bag, that is all I use in the bag. You end up with a bag that feels about like sand but is as heavy as a metal bag and because it is only one uniform filler it plays very consistent.

