Whats
SFI approved means they were submitted to be tested by SFI for a spin test to 11,000 RPM and passed.
The Chinese ones are marginal in my opinion. Professional Products is one that comes to mind. Pro Form, Pro Comp are also Chinese made products.
Some of the good AMERICAN ones are made by ATI, Fuiddamper, TCI Rattler.
Also I use the SFI approved PRO RACE brand, which is made in New Zealand and is less $$ than the 3 above.