The Do-It Molds Cannon Ball Sinker model CB21216B is a cannonball sinker mold with 2 sinker cavities: an 12oz and a 16oz. Cannon Balls drop faster and straighter than other sinkers. Load your rig with these round sinkers and shoot your lure down to the depths you need. The Cannonball Sinker Mold affords you the opportunity to make your own fishing sinkers. This model has 2 cavities - one each for 12 & 16 oz.