This listing is for one mixed lot of four sticks of PC5-5600B laptop ram. Brands include Samsung and Sk Hynix. The ram sticks are UNTESTED. That's why the listing says for parts/not working. I do not know if the ram sticks function or not. Some of the sticks are 1rx8 and some are 1rx16. THESE RAM STICKS DO HAVE VISIBLE WEAR AND TEAR. See photos. Various countries of manufacture. Please double check the specs and ask any questions before you purchase. The ram sticks are being sold as-is. All sales are final. Thanks.