The standard size is 3.5" x 2.0" (89 mm by 51 mm)
The standard size is 3.346" x 2.165" (85 mm by 55 mm)
The standard size is 3.582" x 2.165" (91 mm by 55 mm)
The standard size is 3.543" x 1.968" (90 mm by 50 mm)
The standard size is 3.54" x 2.165" (90 mm by 55 mm)