R. Crankcase Cover Gasket for CB50J/S. Model is CB50-100/AC02-100-110. Thickness is about 0.5mm. Aftermarket. We use sheets made by Japan Balcar Industrial and are certified by professional shops. Fits Manufacturer Part Number: 11393-KN4-751 The color of the material may change without prior notice, but the performance of the product does not change.