If the size of penetrating (or other) elements is precisely defined, whenever the text first time refers to their size or when that size has changed, state the exact length/height, circumference, or diameter in inches or cm (use the same units as in prompt), avoiding general terms such as long, short, large, small, thick, thin, etc. Centimeters are given to the nearest 1/2 cm. Inches to the nearest 1/4 inch.