Scratchbord is easier to scratch into for clean, crisp details and lines and unlike paper scratchboards it will not rip, tear, bend, or wrinkle.
 
Scratchbord 5"x7" (12.7cm x 17.8cm) 1/8" (3.1mm)
Scratchbord 8"x8" (20.32cm x20.32cm) 1/8" (3.1mm) 
Scratchbord 8"x10" (20.32cm x 25.40cm) 1/8"(3.1mm)
Scratchbord 9"x12" (22.86cm x 30.5cm) 1/8" (3.1mm)
Scratchbord 11"x14" (27.94cm x 35.56cm) 1/8" (3.1mm)
Scratchbord 12"x16" (30.5cm x 40.64cm) 1/8" (3.1mm) 
Scratchbord 16"x20" (40.64cm x 50.86cm) 1/8" (3.1mm)
Scratchbord 18"x24" (45.72cm x 60.96cm) 1/8" (3.1mm)