920d Custom specifically engineered their ES-335 Vintage upgraded wiring harness to easily drop into your guitar and totally transform your tone. Your guitar will have the classic sound of a vintage ES-335. The wiring scheme provides a tight, transparent tone. Unlike modern wiring schemes, it features a reduced treble cut when rolling back the volume control. The highs sound clearer, especially with the volume pot rolled back. This harness effectively gives you a treble bleed kit function on each volume pot, without adding extra caps and resistors. If you’re looking to clean up your tone and let your pickups truly shine, the ES-335 Vintage upgraded wiring harness is for you.