The Colonial Needle has the Roxanne thimbles on their site with instructions of how to get correct size. The 1st one I ordered, was 1/2 size too big, I sent it back and they replaced it with a smaller needle, It was from another site though, and that site is no longer available. And TJ Lane thimbles, just type in TJ Lane Thimbles and you can find their site that way. The TJ Lane thimbles are guaranteed. I have had 2 of her thimbles fixed, got holes in them as they are sterling. I really love my TJ Lane thimbles the best, pricey, but to me they are the best. When quilting on with a fabric that is denser, I use the Roxanne, as it is a heavier thimble, and I don't think you could poke a hole in it.