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Your thumbnail is about 10 millimeters wide.
Normally a pen is somewhere around 8mm wide but you never know, there may be 8cm wide pens! Normally 8mm
This is estimated to be 100 microns. There are 1000 microns in a millimetre. So in millimetres, a human hair is approx 0.1 millimetres in width.
1 foot wide by 600 feet long. 2 feet wide by 300 feet long. 3 feet wide by 200 feet long. 6 feet wide by 100 feet long. 10 feet wide by 60 feet long. 15 feet wide by 40 feet long. 20 feet wide by 30 feet long. These are just examples. If you hold yourself to integers, it is any combination of the factors 1x2x2x2x3x5x5. If you do not hold yourself to integer factors, the possible combinations are infinite. (e.g. 4.75 feet wide by 126.3157895 feet long)
15 cm long and 5 cm wide is pretty nearly 15 cm long.