I do a lot of legal work. When I go back into old files I find rusted or tarnished paperclips that mar the pages. The vinyl coated clips do not expose archived documents to rust or other matter that will leave marks on important papers. Even when exposed it takes over 20 years for the plastic coating to start cracking. Sealed in files they usually do not deteriorate at all. Great product in both sizes.
I used this paper clips because they were vinyl coated on my neighbors vertical blinds. I held up the bottom of the panels with these clips so that they would not make a mark. My neighbor has MS and uses a wheel chair to get onto her deck through a sliding glass door. In addition I have my own child care in-home business so they are a great asset.