OTHER SIZE & MATERIAL OPTIONS: ACRYLICS AND POLYSTYRENE AVAILABLE: scrk039-66 Clear Acrylic, 39mm (66.7 Insert) $ 2.10 scrk039-67 Clear Acrylic, 39mm (67.7 Insert) $ 2.10 scrk043 Clear Acrylic, 43mm $ 2.75 scrk050 Clear Acrylic, 50mm $ 3.90 scrk239 Brown, 39mm (67.7 Insert) $ 2.10