This listing includes 10 copyboard cover hinges designed as replacement parts.These components are compatible with MF series models 4010, 4012, 4018, 4120, 4122, 4140, 4150, 4300, 4310, 4318, 4320, 4322, 4330, 4340, 4350, 4352, 4370, and 4380.The hinges function to restore the of the copyboard cover assembly.This accessory serves as a direct fit for the specified machine models to facilitate repair and maintenance.