Howdy from Texas, I was chosen as an Ambassador for Glory Nock to review and test them. This nock came on the scene for sale May 2018. Here's my review. They are offered in X size and have the "fit" collar system. I test all manner of things and shoot about 5 different arrow setups. So that's handy. But, if you shoot standard diameter carbons like Gold Tip Hunters, the Fit will work. The Micro diameters are not a possibility at this time. Anyway - Glory Nocks "fail on". Nice feature for bowhunting.