These Bearing balls were Manufactured by PGN bearings but I am not part of the company PGN Bearings. My source says these are G50 steel which indicates they are not manufactured with a high enough tolerance to use in precision bearings for things like vehicles. The imperfections in size, shape, etc... is not enough to feel or see by eye and should certainly not have noticeable effects in aerodynamics or ballistics making these great to use as slingshot ammo.  These bearing balls have a standard size(that's a little on the small side) and weight for steel slingshot ammo so these Carbon Steel Balls can be used with good FPS with most Slingshot Band sets even some abnormally light draw weight Bandsets.

Comes with a small cloth baggie(random color) for convenient storage but although the cloth baggies do have built in string to open and close easy it tends to open a little to easy under normal conditions. If the cloth bag is near fulll but the bag is closed and it tips over theirs a chance of the weight of the Ammo opening the bag spiling the ammo all over the place so i recommend tieing the string in a knot so it can't open as easily and only use the small cloth baggies to store ammo when not in active use and get a decent ammo pouch for when your using the ammo.