This item fits various models including Buyang, Roketa, Coolsport, BMX, Kazuma, Sunl, AIM-EX, Baja, Panterra, Stream Eagle, and other unlisted makes and models. Compatible with GY6 QMJ/QMI157, QMJ/QMI152 4-stroke engines. The ignition coil improves combustion efficiency and enhances electrical performance. Direct replacement for original equipment; easy to install and ready to use. CDI box fits GY6 50cc-150cc engines, including 139QMB, 152QMI, and 157QMJ models. Connector type: AC fired, 6-pin male plug. The orange CDI is an ignition module with no rev limiter and features a single-stage advanced timing circuit, providing improved throttle response and higher top-end RPM. Spark plug model: A7TC. Color: As shown in images. Material: Aluminum. Thread diameter: 10mm. Hex size: 5/8 inch. CDI dimensions: 75mm x 42mm x 24mm (L x W x H). Ignition coil overall length: 19 inches (50cm). Wire length: 16 inches. Package includes: 1 x Ignition coil 1 x CDI box 1 x Spark plug Note: Other items not included. Lighting and display settings may cause slight variations in color between the image and the actual item. Measurement tolerance: +/- 1-3cm.