blade is about 3.5 inches wide and 3/4 inches thick. handle is about 1 and 3/8 inches wide and 3/4 inches thick. There is some slight variation, as they are hand made. I have never had any flex issues, even with very thick mashes.
I bet the paddles ship very conveniently along side one of the Brewhardware.com sight glass kits...I used their weldless keg conversion kit to make my brew kettle, and it is awesome!