Roobet does not charge any withdrawal fees. However, their are network fees for every transaction sent through the blockchain or Ethereum network. These fees are determined by the ever-changing price of cryptocurrencies as well as the high volume of transactions that may be going through the blockchain or Ethereum network at that time.
For Bitcoin the transaction fee can be found at the bottom of the withdrawal page of the Cashier window. You will also notice there is a priority option - Low will be the slowest withdrawal speed, but will also be the smallest transaction fee, Medium will be faster than Low, but slower than High, and High will be your fastest withdrawal fee, but also your highest transaction fee.
For Ethereum, just like Bitcoin, your transaction fee can be found at the bottom of the withdrawal page of the Cashier window. When withdrawing with Ethereum, there is no need to worry about selecting a priority.