3 8 Foam Core Board, I would think Gator Board which is much

Gator Board Strong Foam Board

20 Pack White Foam Board 12 x 16.5, 3/16 Thickness

Foam Board Printing - Coastal Creative

Gatorfoam Board - Brown, 22 x 30 x 1/2

Gator Board Printing Custom Gator Board Signs

20 Pack White Foam Board 12 x 16.5, 3/16 Thickness

Gator Board Strong Foam Board

Metal Sawtooth Foamboard Hanger - 3/4 Tall and 5/8 Wide

FanFlex: Lightweight flexible crests and patches that fold easy. - FanTex: An all-new super comfortable soft fabric. - FanFit: The authentic on-ice

White Gator Board - 3/16 Thickness - Multiple Sizes - 10 Pieces - 10 pc Multi Pack - Rigid Foam Backing Board (12 x 18)