3/16" thick acrylic. Comes in 4 Sizes! Our TopLine TRI FOLD Counter Guard is sold as a complete kit. It includes: one center acrylic panel, two side panels and 2 clear flexible corner connector channels. The channel connectors allow the shield  to be self standing in a Tri Fold shape.  Ita also comes standard with a 12W x 3"H transaction slot in the center panel which can be customized upon request at n/c.. Simple to clean - use a soft cloth and soapy water only. Do not use scouring compounds or chemical glass cleaners as they may harm surface. Nominal size variation up to .5".  We also offer Freestanding single panels, L Shaped,  Hanging & Cubicle Topper Shields.  Made in USA