Hobby Stock and Empty will begin pre-orders tomorrow (3/18) for a set of Ace Attorney and Ace Attorney Investigations straps. You'll be able to buy the straps individually for ¥500 or in sets of ten for ¥5,000.

Have a look at the straps here. The "question mark" straps are included as secret straps in the sets of ten.

You'll find details at the Empty site.