The Phred Instruments Hi-Phi Aluminum guitar knob is a reproduction of the knob used for the Bass, Treble and Input selection of a 1960s Lafayette LA224-T Solid State Amplifier, and also similar to the knobs installed on Jerry Garcia's Doug Irwin Wolf guitar and Travis Bean TB500. These are the Jerry Garcia Wolf knobs you're looking for! Available in Aluminum for $21.50 each, and Gold-Plated Aluminum for $23.50 each. Quantity can be adjusted in the cart after adding the item to your cart. Maximum of 4 per customer.