Offered quantity: they are about 100 grams per pack, and you can use it for a long time, which is more important that these polishing media pins could be applied repeatedly. So you can definitely meet your different needs Applications: Tiny pens reach to the tightest areas. Abrasion-free pens will never wear out and last a lifetime. These are ideal for use in a wet tumbler for polishing brass, steel, aluminium or titanium. It is specially developed for tumblers and polishers Methods of use: Fill your cup with pens and brass, but leave space to allow for tumbling. Add clean hot water until the cup is almost full. Cold water works well, but hot water cleans faster Material: these types of stainless steel pins are made of stainless steel. They are attracted to the movement of the magnets and will not rust like steel balls. Therefore, they can be used for a long time Diameter length: the pins with larger diameter ensure a higher weight and more impact on the during the finishing process