I have used a Damascus glove and calf hair tab a lot in the past. Now I use a cordovan 3 under tab that we make. It has a palm tab, cordovan, and a backing. It makes good use of an O-ring to attach to your finger, an idea that we got from Lenny Rock at Bob Lee about 3 years ago at Denton Hill. We make it in 3 under, with an option of O-ring sizes. Also, we make it in a fixed O-ring size and in a model that allows for the changing of the O-ring to a different size. We offer calf hair also, which gives an excellent release, but wears out much quicker.
We haven't advertised these EFA tabs, but those who have tried them seem to like them a lot. Unfortunately they don't wear out, so repeat business is not an option.