RD-B2 pedal board has a very special hollow design, enable convenient arrangement of wires; what’s more, its unique way of fixing power supply by using an additional elastic string, suits any volumes of power supply: from JOYO JP-04, T-rex, to huge VoodooLab. All types of power supply can be fixed to the bottom of this pedal board easily with a buckle, without punching holes. Yes, simple as that! .