Dynamint Jumbo-Pack is the economical, labor-saving pack for easy dispensing on large dairies and where Dynamint is used daily. The 4-liter pack (135 oz.) is used with a reusable squeeze pump (DD0999 sold separately) which may be operated with one-hand. Heavyweight plastic bag is folded over at the top and fitted with a grommet for hanging.Dynamint is a true oil in water emulsion which delivers the potent properties of essential oils through the skin and into the soft tissue. Dynamint contains peppermint, tea tree, eucalyptus and calendula oils, known for their antibacterial and conditioning properties. The light, non-greasy water-based cream goes on smoothly and penetrates by osmosis rather than simply remaining on top of the skin. Dynamint Blue contains a temporary blue coloring agent which makes it easy to see which cows have had an application.Dynamint can be used as part of a massage program to help prevent udder edema, mastitis and infection. Many dairymen report massaging with Dynamint to be as good as an oxytocin injection for milk let-down. Others report fewer and milder cases of mastitis after massaging, thus reducing the need for antibiotics. Dynamint is now approved for organic use.