Two "plaque removal" brush heads. Fits most Sonicare click-on electric toothbrushes. I bought this package by mistake instead of the "gum care" type, and the first one I tried turned out to be too aggressive.
From a household with a dog, although it's been on the counter this whole time.
Sonicare brush heads (North Juanita area of Kirkland)
This post has been withdrawn.