The heading's subheadings for V-belts and synchronous belts are defined by specific circumference ranges (e.g., 60–180 cm, 180–240 cm, 60–150 cm, 150–198 cm). Measuring the outside or inside circumference of the belt — as specified in the tariff schedule — is therefore a required step before assigning the correct subheading, and a mismeasurement can result in misclassification.

Conveyor and transmission belts are flat or profiled continuous-loop articles designed to move materials or transmit mechanical power, and they classify under 4010. Textile-reinforced hoses are tubular and designed to convey fluids or gases, classifying under 4009. The tubular versus flat/loop form is the primary distinguishing feature.