I just went out and bought a Razor Strop 23" Long Red Russian Leather, i got this to touch up my knifes after i have sharpen them. I have had people to tell me to buy and use the red oxide powder on my strop, i have also seen this green bar chromium oxide powder and the white bar aluminum oxide powder and on this other site i seen Strop Abrasive Powder, can anyone tell me what i need for my strop to use on touching up on my knifes. thank you