This key can be used to open supply crates in the game Team Fortress 2. Additionally, this key can also be sold on the Steam Community Market, and the funds will be added to your Steam Wallet, which can be used to purchase other Steam games or items. Please Note: 1. Product is available as long as it can be purchased. 2. Provide your "Trade Offer" link when placing an order so it can be processed immediately. 3. Your Inventory must be set to Public to receive the trade offer. 4. Ensure your account does not have a Trade Hold to enable instant delivery. If you're still confused, feel free to contact us directly via message, mate :)