Choosing multiple sizes to work on will have a big impact on your risk management strategy. well don't be too risky ... being aggressive is one thing and then something is stupid ... risking 2% of your account in every trade. I think a lot of the best to trade is 0.10 or 0.20. and the most effective value of tons to be used for trading is the size of 10 tons, regardless of the deposit you make in your account, it will be traded for you with the smallest risk and also a good profit,