All double short or long etf's are trading stocks. You never hold long. I recommend reading the SDS or better SRS boards. these reset every day so they change, and on options ex day they have to reposition - which will also cause them to loose money - they won't typically loose 100% of their value but they will trend down over time - just check them all!!! These are for trading - they even tell you they reset every day - not weekly, or monthly.