go to www.tackleunderground.com for info on what and how
You can get components at Jann's netcraft, Stamina Inc., Barlows, and Ztackle just to name a few places.
A gallon will make more than you will want to pour.
Do a search here and find out how to make your own 2 part molds from plaster of Paris. It will cost you less than $5 and you can have any size you want.