The 3" Puck version of the Glycerine shave/soap is made to fit into your mug. You can wash, and shave your face with this dual-purpose all natural Glycerine puck. To shave work into a lather either with your hands or a wet shave brush, massage onto your face and shave. The Glycerin with Vitamin E, Safflower, Palm and Coconut oils protect your skin and help your blade glide leaving you with smooth skin and no residue. The Puck fits perfectly into the refillable Field Shave Soap Canister.