Review title is Hair damagers for sale.. [SEP] One of the jagged  white ends got caught in my hair and I gave up. Taking it out of my hair was more than half a nightmare. I returned these.<br /><br />These are a mm wider in diameter than advertised, FYI. See pics. One pic shows a blurry, jagged white end piece (sorry it's the best pic I could get!). One pic show the item side by side with the once popular grey loop rods (with a known diameter of 8mm). This item is visually larger in diameter.<br /><br />I only used one long enough to get it stuck and unstuck. I don't know how they will work exposed to perm chemicals.<br /><br />It feels like I could sleep in them if I wouldn't have to shave my head the next day.<br /><br />The end piece is not detachable. The hair tangles around the end piece.<br /><br />One more thing, this is my second attempt at ordering. I got a larger size on accident the first time, although it came in the mail quickly. I returned those and now I got these 4 days later.  I ordered the blue-colored rods to be delivered to me. I was told that the color is random, the size is what matters. I measured the new rod diameter and it's approx. 9mm diameter.<br /><br />Instead of these, I ordered small, yellow, straight, plastic rods. They are smaller and easier to handle than this product and also the grey loop rods. It's hard to find a small diameter in a rod.