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Product parameter: OE/Code: 14711-KRN-670 14721-KRN-670 Feature: 1.Material:Black Diamond; 2.Complete Valve Set:2pcs intake valve & 2pcs exhaust valve; 3.Long longevity of great load capacity and outstanding power; 4.Stable performance:Advanced technology and materials to improve the performance of intake and exhaust efficiency to ensure stability. Attention: In order to avoid making troubles to you,please ensure this part fit for your motorbike.Please contact us with any questions regarding the product at any time,especially for the year/brand/model. We will try our best to serve you. Sincere regards to all buyer!