Our shelf brackets are a 1/2" thick clear acrylic wedge attached to a 1/4" clear acrylic back plate.  Four screw holes are provided for secure mounting and can be covered by ordering a custom cover plate in clear or bronze mirror.
 
Available in a 2-pack for $37.38 ($18.69 each) or a 10-pack for $135.70($13.57 each).