Fioroni Ultra Racing Series Option Team 3mm Hard and Lightened Chassis for Ofna Jammin X1-CR buggy and Ready-To-Run buggies. CNC machined from 7075 grade aluminum and anodized with laser engraved logos. Ergal 7075 Chassis is hard anodized for longer life, 3mm design to save weight and allow more chassis flex for super rough tracks.