Donner Guitar Effect Pedal Coupler Connector 1/4 inch 1. Material: Metal. Color: Golden. 2. Great signal transmission.It's great for use with effects/pedalboards! 3. Great for use with effects.Compatible with most pedal board: Boss, Marshall, Korg, Dunlop, Fender. 4.Space efficient all metal effects pedal couplers. 5.1/4 inch (6.3 mm) male to 1/4 inch (6.3 mm) male couplers.