Ornament (bulb) clips are compatible with at least 3 different bulbs, the round Dollar Tree bulbs, the round Michaels bulbs, and the M&M shaped Michael's bulbs. I'm sure they'll fit more than just those though. Comes in a 4 pack. You'll need an Imagination3d adapter, either the adapter that's made for these or a pen adapter will hold a few at a time. Assorted colors. Clips ONLY.