This thimble is much like the domed under thimble, but it has an indentation—a dimple!
I think I'm getting smaller stitches with this one! The needle tip seems to turn to go back up through the fabric more cleanly. That said, the dimpled thimble doesn't sit as flat on your fingertip as the domed thimble does so it doesn't feel quite as natural on your finger. That's why I'm using them both. Sometimes I like one better than the other.