I took out one of my old Berdych frames for a hit yesterday. 12.7 ounces, swingweight of about 395. I hit fine with it but it wasn't as stable as my regular frames. I recall the first time I hit with them about 10 years ago: I couldn't hit a topspin backhand with them because the swingweight was so high. I could only slice backhands. My regular frames are 13.25 ounces, 386 swingweight so easier to swing but the extra lead makes them feel much more comfortable.