Feature: 1. The worn chain does not move smoothly and the sprocket wears faster. 2. Fine workmanship easy to replace old or damage chain. 3. All chains are strong and durable long life. 4. Easy to use convenient and practical. 5. Suitable for electro‑tricycle electric scooter electric bicycle. 6. 4 different types for you to choose meet your different needs. Specification: Condition: 100% brand new Item type: Electric Scooter Chain Material: iron Color: As picture shown Scope of application: Scooter Optional type: 25H chain T8F chain 420 type chain 428 type chain Model: T8F chain Number of sections: 120 sections Inner diameter: Approx. 4mm/0.16in Adaptation: 54 tooth sprocket Model: 25H chain Number of sections: 114 sections Circumference: Approx. 74cm/29.1in Inner diameter: Approx. 3mm/0.1in Model: 420 type chain Section Pitch: Approx. 12.7mm/0.5in Number of sections: 70 sections Circumference: Approx. 889mm/35in Inner diameter: Approx. 6mm/0.2in Model: 428 type chain double-row chain Number of sections: 102 sections Inner diameter: Approx. 7.5mm/0.3in Package List: 1 x 25H chain or 1 x T8F chain or 1 x 420 type chain or 1 x 428 type chain