1) Pourer ball bearings dont fall into the bottle thanks to our special patented design. 2) Smoother pour with less sticking ensured by a primer ring to channel liquor around the inner ball bearing. 3) Greater accuracy means more profit per bottle thanks to the patented three ball design. 4) Easy removal with our "lock-on" collar. 5) Four popular shot sizes 7/8, 1, 11/4, 11/2 ounces, four colors, wide cork (larger bottles) and flip-tops (to keep the fruit flies out).