Its just the blank octopus hide - ready for you to set up.
There's a chamber for adding ballast - you can use concrete.
There's a hole at the front for adding a bridle, and vents at the rear for the sand & water to drain out of when you're pulling your hides to the surface.
This is a generously sized hide - 390mm L x 165mm H x 165mm W
Blank as shown in the photos it weighs 900 grams, when filled with ballast, it weighs 3.75kg