You will win a random item from the market for the average market price+(5% fee), the price differs every second, but it will currently be ~Ŧ

Warning: Our client script have been reported to stop on the wrong item sometimes, probably because our script uses a timer to stop the items, and the timer may be different or delayed on some clients. The item that you win will always be the item that the server picked and that will be shown in the pop-up box when the case stops.
We do not refund you if the client-side script stop on the wrong item!