Thang Hoang , Jul 23, 2003; 11:13 p.m.
I have 2 20x30 plus size prints hanging in my home office. One is mounted in glass with a simple black metal square edge frame. The other in plexiglass (plastic) with a plastic black round-edge frame. From a distance I can't tell the difference which is glass, plastic, or metal.
I would assume from a weight point of view, if you use glass, you would have to use a strong metal frame. I'll assume "support" means how do I hang it. Both frames have picture wire and they are hung on screws inserted into wall anchors.