16 centimeters is equivalent to 6.3 inches.
To put this into perspective, the average length of a credit card is 3.37 inches, so 16 centimeters is nearly twice the length of a credit card.
It is also slightly longer than a standard highlighter, which measures about 5.5 inches in length.
Furthermore, 16 centimeters is slightly shorter than the diameter of a standard basketball, which is about 9 inches.