Read overall, insertable, and width measurements
Use the right numbers when comparing two compact products.
Compare usable length separately
Overall length can include a suction cup, handle, or a shaped base. Insertable length describes the usable shaft up to its stopping point. The B Yours 4.5-inch variant lists 3.75 inches insertable, so the two numbers are not interchangeable.
Distinguish width from circumference
Width or diameter goes across the shaft. Circumference goes around it. For a roughly round cross-section, a 1.25-inch diameter works out to about 3.93 inches around. Treat that conversion as an approximation for tapered or oval shapes and ask where the measurement was taken.
Compare the exact variant
Check units, color and size on the page before comparing it with another model. A term such as mini or slim can describe length, width, or both. Leave an unlisted measurement open until the maker confirms it.