You buy one Decksaver, you know how all of them are. Not cheap for formed pieces of acrylic, but perfect for their job: protecting the instrument's front side from bumps, scratches, dust, and cats who enjoy sleeping on your gear.
There's nothing special about this one compared to any other Decksaver, it works exactly as intended which is all you could hope for. I'm really happy they made one for the Osmose though, as it's one of my fave instruments ever, and I'm glad I have extra protection for it when it's not in use.