I recently purchased the High Purity Germanium Metal and I must say that I am quite impressed with the quality of the product. The metal is 99.999% pure and comes in 250g with 12mm or smaller pieces, making it an ideal choice for various applications such as semiconductors, infrared optics, and solar cells. The packaging of the product was excellent and it arrived in perfect condition. The metal was shiny, and the pieces were uniform and of good quality. I have used it for infrared applications,See full review