The third needle type consists of circular needles, which are long, flexible double-pointed needles. Drug users have high rates of unsafe needle use including sharing needles between people. A hook gauge is used for measuring both knitting needles and crochet hooks. Examples of such instruments include scalpels, hypodermic needles, and artificial pacemakers. Finally, there are sundry bags and containers for holding knitting, yarns and needles. Awls, scissors, pins, needles, and thread for mending were required. There has been transmission in hospitals in some African countries that reuse hypodermic needles. It was also a pioneer in the production of hypodermic needles. The needles and equipment used are sterilized. A pins and needles sensation is common. There are several shapes of surgical needles. Acupuncture is the insertion of thin needles into the skin. Incisions by laser are significantly smaller than those of spokes or needles. Infections were mostly caused by poor sterilization of acupuncture needles. Also in and around Aachen chemicals, plastics, cosmetics, and needles and pins are produced.