What is it actually?

The Tree itself:

The BottleTree® is a successful symbiosis of fun and technology.
As a construction made of steel or stainless steel, it can be zinc-plated or painted on request or the surface can even be processed according to your individual requirements. Thus, it is a real eye-catcher even when empty and almost an objet d'art. The tree can be filled with over 350 empty Champagne bottles and is a splendid "monument" to the fun experienced by party guests and fun-lovers. Plus, nothing can motivate people to drink more Champagne than a half-filled BottleTree®!