The genuine Japanese Salux wash cloths are amazing. I don't know personally about the Chinese/other knock-offs, but the reviews for those are bad. So, really, if you get one that rocks your world and lasts and lasts (I'm still using the one from 2009 with not a sign of wear/tear) and makes so much lather you extend the life of your bottle of pricey hypoallergenic or costly perfumed shower gel, than you got the real thing.These are long and they are rough-textured. I have sensitive skin prone to eczema, and I was afraid to use it. But I find if I don't use overly hot water and don't scrub too long, I'm fine. I do what a lot of sensitive skin folks do--I cream up forehead to toes as soon as I get out of the shower while skin is moist. With these towels, I know I got the dead skin and dirt off, and I can cream up with confidence.The trick with the towel is to wet it thoroughly BEFORE you squeeze on a dollop of your shower gel or rub your bar of soap on it --works best with liquid soap or gel, just so you know. Then squish and mush it up in your hands. It will lather up like mad. Even gels that didn't lather up much in regular cloth towels for me, they later up a lot with the Salux. Which is GREAT.Okay, so then you keep the towel out of the strong water stream, or the lather will rinse right off. That's one of the key things about the Salux. It rinses thoroughly FAST. No residue. So it stays fresh-smelling, clean, and keeps working just right.The only reason I'm ordering more is that I gave my back-up one to hubby to scrub his back--the Salux is long enough that you can open it up, hold end to end, and scrub your back. So, I want two to have a back-up for him and for me. Or even to add to gift baskets. Cause, really, these things don't seem to wear out. Like I said, 2 1/2 years and counting..still going strong.If you hate rough-textured stuff, skip this. If you love how soft your skin feels and how unclogged your pores are after exfoliating, this is a wonderful invention of a wash cloth. Try it. It's pretty cheap for its usefulness and durability. (Great for scrubbing rough elbows and soles of feet, too, after pumicing, to help fully smooth out.) I keep one of those old-fashioned laundry clips I inherited from MIL (top is like the hangar hood and bottom is like those bag clips) and I keep mine hanging to dry in the shower off the towel rack that's in there. Dries fine.If you have Keratosis P on your upper arms (like I did), this baby took care of that. I have smooth arms now.In case you're confused about the numbers--100, 300, and such--my understanding from the official Salux site is that the number is for the color/packaging (how many and what colors), but that they are all the same size.Enjoy.NOTE: I ordered from DANIEL'S HOUSE on Jan 19 and got it fast and it's the REAL THING (at least judging from the packaging, which is the same as my original order of SALUX from a Japanese market. I also felt it with my fingers and compared, and it feels the same. HTH...