These are unique, in fact we've never seen a similar pair. These would be considered humane as there are no rowels, just a beautiful large concho on the back that can be pressed against the horse to emphasize the leg aids. These are slip on, no spur straps required! Black steel with a beautiful concho.
Measurements are approximate, 3" long and 3" wide where your boot would fit. The width can be changed slightly by opening the spur up a bit more or closing it down. It won't spread a lot, you wouldn't want it to, but it will spread or close slightly.