1/4 inch 18 inch x 24 inch Clear Acrylic. Pick-up Instructions: When placing your order online for this material, please select Campus Pickup and then select location Pickup in MAD Shop. Once you have placed your order, please email Dan Beaver (dbeaver@uwaterloo.ca) to arrange a date and time to pick-up your order. Please remember to bring your receipt when picking up your order to verify your proof of purchase. MAD supplies are only for INTEG 321 courses. Any orders placed by students not enrolled in INTEG 321 courses will be cancelled.