This is a very confusing description. I don't clearly understand how the wallet operates and I'm not sure why it shows +$15 for the clip or strap...isn't that part of the wallet?
tedhershSearch youtube or their website for videos on how the wallet works. The base model is the plastic one (which only comes as a cash strap), you're adding $15 to upgrade to the aluminum version (which has the option for either a cash strap or a money clip, and $45 to upgrade to the carbon fiber.