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It is an abbreviated form of Chromium Oxide. I got mine here https://shavenation.com/collections/strop-dressings/products/shave-nation-chromium-oxide-bar-xl-size although in the UK there might be...

Thank you all for the advice. I should have said that I do have a leather strop, it has the poly webbing back. I have a linen one coming at Christmas.

My CrOx crayon came from shavenation.com so...

I have been using straights since June now and have three blades in rotation. I am at the point where I feel that one of them is ready for refreshing or honing (happy to be guided on terminology...