Available Sizes:

Internal Size: 16 x 20 inch (410 x 510 mm)
External Size: 21.5 x 25.5 inch (545 x 645mm)

Internal Size: 24 x 36 inch (610 x 915 mm)
External Size: 29.5 x 41.5 inch (750 x 1055 mm)

Internal Size: 24 x 48 inch (610 x 1220 mm)
External Size: 29.5 x 53.5 inch (750 x 1360 mm)

Internal Size: 24 x 64 inch (610 x 1625 mm)
External Size: 29.5 x 69.5 inch (750 x 1765 mm)

Internal Size: 30 x 40 inch (760 x 1020 mm)
External Size: 35.5 x 45.5 inch (900 x 1155 mm)

Internal Size: 36 x 48 inch (915 x 1220 mm)
External Size: 41.5 x 53.5 inch (1050 x 1360 mm)