Yani, this one is just a little smaller than the orange one I used on my P15 for years.
Bob, this is from the Zerust web site:
http://www.zerustproducts.com/what-is-zerus
How it Works - Zerust products protect against rust by releasing an invisible, non-toxic, non-reactive, and odorless corrosion-inhibiting vapor. This vapor protects metal components from corrosion for up to five years. Protect a range of metal items including those created from aluminum, brass, copper, iron, nickel, steel, and silver.
The box is made by Flambeau:
http://fishing.flambeauoutdoors.com/.../dry_boxes.asp