I bought a bunch years ago when they were on sale for cheaps (10$ a box). They come in two wad colors, black and fluorescent orange to suit ambient conditions - black seems to work best most times. They are moving at pellet speed, so they can be difficult to see. I conscript the other shooters on the line when I'm using them. They are beneficial in helping you determine if you are consistently shooting off-target. Also beneficial for helping new shooters. However, at 17$ a box, I'd think twice.