It requires tremendous force to drive an unlubricated case into a full length resizing or forming die. But, the wrong lubricant can ruin cases or break shell holders. Forsters high pressure lubricant adheres to the case when it's forced into the die and you can barely feel the cases enter and exit the die. This high quality lubricant makes resizing easy and it saves your equipment. Available in 2 oz. plastic bottles. (Oil based lubricant) Mfg: Forster