REDLINE is local brand R&D with imported material. More than 14 years in market. But the boss hardly do any advertisement. Quite selective for their reseller.

In most case, REDLINE product price slightly higher than S & W brand you mentioned above.

Can't comment much on S or W brand because I never use any of it. As I know, they are opportunist use their name to gain benefit in market.

For REDLINE, I only get directly from the one and only source. REDLINE office. They are authorized for K&N product as well.