This comes with approval. 1/2" bore. Black anodized. Fits regular 1" diameter handlebars. The Rebuffini Ellipse hand controls have been precision manufactured from the finest aluminum available. Switch housings, replacement levers and rebuild kits are identical to those used in the Rebuffini Comet hand controls. Note: Hand controls with approval come with a small fluid window to monitor brake fluid level. Note: With approval. Check your local MCS dealer or the MCS sales department for exact type of approval and validity on bike model and years on the test report.