About this item Replacement speaker unit repair parts compatible with QC45, QC25, QC35, QC2, QC15, QC3, OE, AE2, Studio, Studio 3, Studio 2.0, B0500, B0501 headphones. Also compatible with Marshall Major 2, Kraken 7.1, Skeleton Hesh 2.0, 3.0, AKG K420, K430, K450, K55, Sony MDR-CD280, and other 40mm headphone speakers. These 40mm speaker headphone drivers deliver great sound quality. The 32ohm replacement speaker parts can fit both the left and right sides of your headphones. Note: The speakers have a positive and negative electrode. The positive pole is marked with a small dot of color, while the unmarked point is the negative pole. Please avoid soldering for more than three seconds to prevent damage to the voice coil lead or the circuit board, which could result in a short circuit. Package includes: 1 pair of speaker parts (2 pieces). Dimensions: 4.5 x 3.2 x 0.7 inches.