Yes they are flat tops Bill,still waiting for the guy to get it put together to find those answers for me !!He should have that info towards the end of the week,which will also help me decide if I want to go ahead and shave the head for more compression or not !! If everything goes as planned,I should be hooking up with Frank in Ocala March 14-15 and hopefully pick up my other head from him !! Still have a couple of thoughts running through my head as to which way (NA or ?:evil2:),but I want to get those other numbers before I make a decision !!