If the original bellows on your Omega D-5 or D-6 enlarger has been damaged or is in otherwise poor condition, this is the proper replacement. The bellows are supplied pre-assembled, with the bellows material attached to the metal frames at the top and bottom of the bellows, ready to install on the enlarger. These bellows assemblies are used, but have been cleaned, carefully inspected, and are certified to be in perfect working condition.