I have been straight shavig for a little over two years now, and amazingly, I only have one strop. I say amazingly because I don't seem to be content with one of anything else when it comes to razors. Alas all things come to an end. My current strop is a Dovo 3" Russian leather. I wanted a canvas/fabric strop as well, so I was looking at the SRD Premium II, III, and IV. I'm not really sure the difference or advantages/disadvantages of each, so I was hoping that I could defer to the wisdom of my fellow SRP enthusiasts.