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.
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"