Thank you for viewing! This is a listing for a set of 4 JRC4558DD/2188, glossy finish, tested and working! Early 1980s Glossy 4558DD 2188 All ICs are used, but have been tested for operation using an IC check device (headphone amplifier). I have removed as much solder as possible, but some may remain. How about for the production, modification, or research of distortion or overdrive pedals? These JRC 4558DDs have a rare 2000-series lot number. Shipping will be via Click Post, wrapped in aluminum foil and protected with air padding. Thank you.