I ordered LM90s back around 2017 or 2018 and a lower quality one for resale in my local area. The quality back then was quite consistent and good. I was about to order more but the COVID pandemic happened (In hindsight, saved me from being stuck with huge stock and no sales). When I had tried asking them the differences between the models around end of 2019, it was very inconsistent. LM90 had 2 different corks which was a horrible move since its deceptive to their customers. I have had a very bad experience dealing with Ling Mei towards the end of 2019, which is a shame as their shuttles back then were quite good when I first ordered back in 2018. I still have around 300+ tubes so it will last me a while for personal use haha.