This is bone, not plastic. The holes are sized for cord made from #10 crochet cotton and tiny seed beads. But it is easy to drill the holes out to a bigger size. Other shaping, such as tapering the forks or narrowing the waist to hold more cord, is easily done with sanding or filing, so you can precisely customize this great little tool. The finish is high-gloss, so thread clears the forks quickly, for using speed techniques like the Ziggy method. The weight is nice and heavy for the small size,See full review