I assume these are hair fibers just like Toppik or XFusion, I have been using XFusion fibers for 15 years, get large bottles on ebay for half the price of Dr Yates. XFusion and Toppik are the same exact product, made by same mfg, just different names. I swear by XFusion and have recommended it to lots of people who need it. Ingredients are very good , nothing I would be afraid to put in my scalp. On average I pay about $15 or less for 28 gram bottle.