I have 15 5x7 matted watercolor paintings and noticed this is weighted...do you think this is strong enough to hole the matted painting
It's hard to tell. The card in the image looks to be about 3.5" wide, so your matte paintings would be twice as wide. We carry another weighted card holder (item # 700807EE ) that has a 2.25" base. It might work better for your needs.