It seems there are so many fakes around it's hard to tell what is genuine and what is fake. Generally, buy from a reliable source or supplier and not the online cheapos on whatever sales website.

The two most faked of the above are NGK and Bosch, they are the targeted high value equipment. Both of these companies have taken measures to expose fakes and also verify their equipment but it also requires vigilance by the purchaser.

Visit the various websites/vids and find out how to recognise the fakes.

Beware, fakes can come apart, fall to pieces or malfunction and seriously damage your engine.