This is our favorite cuttlebone holder. It allows the bird a place to perch, holds the dust from the cuttle neatly as they eat it, and has an adjustable strap for different width bones.
No metal parts, so no rusting or poisoning. This is the only holder you will ever need, it is the best.
Doesn't come with a cuttlebone, but we sell high end, grade A clean and unbroken ones. Search "cuttlebone" to find them.