These collar blanks were a real find! (or necklace blank, whatever you want to call them) I am so happy to be able to offer them! They are perfect to use for some gorgeous beadwork or beaded embroidery designs; add some Lacys Stiff Stuff and some deerskin for the backing, and you've got an incredible show-stopping piece of wearable art! These are the smallest size that we carry....3/8th inch. (10mm) wide. They are 15 inches long, made entirely of brass.