360 stainless steel roller rockers on ebay, too good to be true?!?!?

This kinda scares me "WE USE THESE ROCKERS ON ALL OF OUR CHEVY MOTORS, AND HIGHLY RECOMMEND THEM TO OUR CUSTOMERS!"

http://shop.whiteperformance.com/DO...ADJUSTABLE-S-STEEL-ROLLER-ROCKERS-2336-15.htm