Very good quality for research purposes, shows detailed molecular formula accurately describing the content and what it consists of. ***The only thing I wish that the shipping would be faster as the tracking ID unfortunately was not accurate at all, it would say arrives on Wednesday then when Tuesday come by as expected it would say arriving Tomorrow.. Wednesday.. the day it says “Delivery date today!” … to no surprise for past 2 orders this had happened & in a row and now again for a third time.. THEN upon checking the tracking info again it would say tracking is unavailable & now im just left in the unknown. ALL occasions I had to take off from work EXPECTING MY PACKAGE to arrive & IT DID NOT arrive as stated EVEN WITH THE HIGHEST MOST EXPENSIVE SHIPPING OPTIONS AVAILABLE. Apart from that the customer service department is really good and prompt..if only the shipping was better (ESPECIALLY FOR THE PREMIUM SHIPPING METHOD) then i would recommend this to all my fellow researchers and all. +*• I WOULD HIGHLY APPRECIATE ANY HELP OR ANYTHING AT ALL TO RESOLVE THIS ISSUES & another one regarding missing items but i am overall disappointed to an extent but also happy. Would be happier if this was fixed! Thank you, support you!