Nolan Arenado Autographed Colorado Rockies Nike Grey Size 10 Cleat JSA 37968 The number in the listing title is just an inventory sku for our records and is not the authentication number. This is the exact item that you will receive so please see pictures for condition. This is a Nike grey size 10 baseball cleat that was personally autographed by Nolan Arenado. Includes a certificate of authenticity from James Spence Authentication (JSA) and Denver Autographs.