Bullet vibes can be very versatile due to their size and discreetness. They are especially great for external pinpointed stimulation. The obvious use for bullets - stimulation of clitoris and vulva. Also, they are awesome for teasing other sensitive zones such as nipples or inner part of thighs.

Bullets with remote control are fantastic option for couple play. And they can be used as a panty vibe, but while panty vibes designed specifically to fit panties and body curves, you'll need to fixate a bullet vibrator to make it stay in place. You can make sort of pocket in any comfy pair of your underwear where you could put a bullet. Many bullets already sold complete with panties, for instance, Blue Motion or My secret vibrating panty.

Also, I'd like to recommend you to look through the guide to vibrating bullets. It may be helpful!