Previously, I had used a 30 x30 stack in the Japalura Frame. However, I found the Diatone Mamba 20 x20 stack at a reasonable price. The stack does allow for more room to place and protect the electronics. Due to the small size of the stack, the soldering is tedious, but not too difficult to install. Make sure you recognize that the ESC plug for the flight controller has 2 extra pins for the buzzer. Therefore, follow the instructions for proper placement of the connector.