Declaration of Independence on Vellum, Constitution of The United States, and the Star Spangled Banner

I found these documents in my deceased grandmothers trunk in a document protector tube. I know of no more information about these. When I try to unroll them, they are extremely fragile and I am afraid to unroll them further for fear of destroying the documents. Is the Declaration of Independence, a Dunlap Copy, a Stone copy, or an ANASTATIC FAC-SIMILE, it is anyones guess. The Constitution seems to be very old and fragile.  The Star Spangled Banner paper is cracking.