I know how hard it is to purchase a stopper without knowing if it will fit your item so I will be as descriptive as possible. 3 1/8” long, top is 2.75” across. The stopper that goes into the neck of the bottle is 1” long and 5/8” across. This part is straight and not tapered from top to bottom like some. There are 2 seams and a hole in the bottom, possibly mold blown. Fell free to ask questions if there is anything else you want to know.