Here is a list of Brass wire eyes that will fit this Mold
Brass Wire Eyes Downrigger Mold Eyes - Made in USA -50 Pack
Do It Mold Downrigger Ball Sinker
Required Insert -- Downrigger wire eyes
Size 12 lb. Cavities 1 Total
Precision engineered, this 2-piece mold is designed to give you a straight running ball. You will need your bench vise to stabilize the mold as well as heavier casting equipment. If you are looking to protect your boat finish and minimize the electrofield, try coating the balls with a multi-purpose rubber coating (e.g. Plasti Dip) which can be found at your local hardware store.