the picture is a little blurry, but is that photopolymer or P95 material?
P95 - (non glare acrylic) has clear raster beads that are inserted into the sign
photopolymer - is molded with the grade 2 braille part of the sign
and yes like the others have said Gene is the go to guy
IMO .25" thickness is overkill for a sign that size, .125" would work fine