I’m sure everyone wants to get the best price on their photography equipment, including memory cards. On top of the specifications being cryptic and confusing, there is a possibility that the ones you purchase could be counterfeits. Fstoppers recently posted a YouTube video explaining this issue.
To watch the Fstopper YouTube warning click Your Memory Cards Are Probably Fake
Interestingly, PetaPixel followed up with more information. To read this follow up click Are Counterfeit, Scam SD Memory Cards Really a Problem?
Bottom line, just be careful, buy from a reputable source and If it is too good to be true? It probably is.