Thunderbolt Silver is a surfboard construction that gives you the 
most classic riding feel. The laminate uses 6oz + 6oz fiberglass 
on the deck and 6oz + 4oz fiberglass on the bottom, making it 
heavier than other constructions. This increases the feeling of 
glide and cruise, and enables traditional riding. 

Of course, it has the performance and flex of Thunderbolt, so 
delicate board control such as quick pivot turn and setup in the 
wave pocket is easy. You can enjoy old school log riding such as 
hang five and hang ten on small wave, and trimming with curl.