[Features] Most popular belt for power transmission. It does not stretch or shrink over time and is a set free belt that is suitable for multiple carriers, so you can expect a long belt life. [Specifications] Shape: B Shape; Nominal: 81; Usage Limit Temperature: -40 - +70 °C; Electrical Resistance Value: 50 MΩ or higher; The name is the effective pitch circumference of the belt (M shape only) in inches.