Kamerar Professional DSLR Shoulder Rig Stabilizer 3 LBS Counter Weight New Kamerar Balance Block fits very well with the PR-1 Shoulder Rig. It was designed to fit on the Swiss Rods, 15mm rods, and adds 3.5 lbs of counter weight. This Custom-made Counter Weight in at 3 lbs. This listing Includes: 1 x Counterweight; 2 x Red Screws 14-Day Money Back Guarantee!