The tried-and-tested Mach 7-7 took on yet another form in the 1990s when it became the Mike Stewart Mach 7-7. Tested rigorously by Mike Stewart, advertisements suggested that the board could easily handle waves of up to 12 feet with plenty of power and acceleration. Besides the cosmetic change of the black deck skin, the X-Flex Core was added to reinforce the structure and strength throughout.