Jason Industrial 310H-300, Heavy 1/2-(in) (H) Pitch Standard Timing Belt Oil heat and abrasion-resistant. Stock timing belts are listed below. They have fiberglass tension members neoprene body with nylon covered teeth all bonded together for maximum strengthMini-pitch MXL (0.080-inch pitch) timing belts are also available. Jason timing belts are specified by belt length in inches times 10 belt pitch code and a three-digit belt width code which is the decimal inch-width multiplied by 100. Any width available from stock consult Jason for pricing.