Mod® Electronics Oil Caps are high quality, custom-made, hand-crafted capacitors that are the perfect choice for guitars, amplifiers, and all audio equipment. Each capacitor is impregnated with mineral oil for a void-free winding providing highly stable capacitance. The capacitor is hermetically sealed in an aluminum casing to ensure a long life. The detailed construction results in a precise capacitance with a tolerance of ±10%. Mod® Oil Caps also feature a red stripe to designate the outside foil.