and high quality Material: Metal Tooth Number: 11 tooth / 14 tooth / 17 tooth / 20 tooth (Please specify the tooth number required) 11 tooth size: 30mm (Diameter) x 12mm (Thickness) 14 tooth size: 40mm (Diameter) x 12mm (Thickness) 17 tooth size: 47mm (Diameter) x 12mm (Thickness) 20 tooth size: 55mm (Diameter) x 12mm (Thickness) Placement: Front Fits 47cc & 49cc Dirt Bike engines For use with 8mm T8F chain Note: 1. No instructions included. Professional installation is highly recommended 2. Please check the size measurement chart carefully before purchasing 3. Please allow 0.5–1 inch difference due to manual measurement (1 inch = 2.54 cm) 4. The color of the actual items may vary slightly from the listing images due to different screen settings Package included: 1 x Chain Cog