Jupiter Red Astron capacitors were modeled after the legendary capacitors and have a similar style to the vintage capacitors to give a very authentic tone and look, yet with high reliability and longevity. This phenolic case potted tin foil and mylar capacitor yields a uniquely vintage tone perfect for guitar amplifiers and vintage audio amplifiers alike. Construction: Polyester/Tin Foil Case: Potted Phenolic Paper Tolerance: �10% Operating temperature: -55C � 85C, derate 50% at 125C. Leads: 20AWG Tinned Copper Application: Guitar Amplifier, Guitar Tone Control, Vintage Audio Amplifier Made in the USA of US-made materials.