Handlebar: Carbon steel small swallow handlebar, plastic-sprayed, wall thickness 1.0mm Brake Lever: Engineering polymer material Brake Cable: Black copper cap, molybdenum disulfide lubricated Disc Brake Caliper: Full aluminum Disc Brake Rotor: 140mm rotary disc Throttle: Lithium battery dual-button, 3-speed adjustment, with Bluetooth function Handlebar Head: Small V-shaped, full aluminum Headset: Mountain bike 8-piece headset Shock-Absorbing Front Fork: 32mm tube shock-absorbing front fork, head tube 28.6mm threadless Outer Tire: 12" × 2.25" Gelulu rubber tire Inner Tube: 12" × 2.3", full copper curved valve stem, Schrader valve Front Wheel Assembly: Engineering reinforced polypropylene, carbon steel 6900 bearings Rear Wheel Motor: Right outlet, 350W high-power brushless geared motor, hub material reinforced nylon, speed 550RPM, voltage 24V, gear ratio 1:4.5, rated torque 35N·m, tested under 20kg load: 1st gear 8km/h, 2nd gear 10km/h, 3rd gear 15km/h. Continuous test run: 15km range, 2.5 hours duration Frame: Carbon steel, wall thickness 1.0–1.4mm, argon arc welding mixed with CO2 welding Seat Plate: Thickness 2.5mm, laser cut Rear Dropout: Thickness 2.5mm, laser cut Seat Plate Triangle Piece: Thickness 2.5mm, laser cut Pedal Plate: Thickness 2.5mm, laser cut Foot Pedals: Engineering polypropylene Saddle: High-density sponge foam, fabric texture leather, polypropylene base, one-piece molded Kickstand: Iron double-hole sealed spring type Battery Box: Virgin polypropylene material Controller: All-terrain sine wave controller, model JR350W Lithium Battery: Model LN244.5, 22.2V 4Ah Horn: Built-in Front Headlight: Vintage LED, battery-powered (built-in dry cells) Charger: 25.2V — 1A Bluetooth Receiver Board: Dual-channel music Bluetooth, with speaker Surface Coating: Eco-friendly powder coating