They don't work so can't us them. Worst quality office supply I've used the past 50 years. Gives a real negative image for Staples. Good example for my next book "How to destroy a brand"
The great variety of sizes is helpful when shooting them at co-workers who may be 1 2 or up to 5 cubicles away. This also allows you to choose what pain level to inflict. The large size is well within range of the drinking fountain.