These are 4 Physically accurate high fidelity audiophile film capacitors. 3 Jantzen capacitors of various microfarad sizes and one Audyn capacitor. The varied sizes that are included in this kit are: Jantzen 0.33uF at 400VDC Jantzen 1.0uF at 800VDC Jantzen 0.33uF at 1200VDC Audyn Plus Cap 0.15uF at 1200VDC Each capacitor is measured with physical tolerances. The kit also includes a 1 inch reference scale to calibrate to. Each capacitor includes the internal foil and dielectric structure. Use these capacitors to mock up your next analogue component or amplifier.