Mini 4WD aluminum rollers, 13mm. Color is black. These are not anodized, but genuine Tamiya parts. These are used, so I've marked them as slightly dirty, but please check the condition carefully in the photos. Please consider this with the above in mind. I'm selling these because I've retired from Mini 4WD. If you have any questions, I will add more photos. Please understand that I will not accept cancellations after purchase.