The Bead Oracle will help you decipher bead measurements, but also how many beads are needed for the length of the item your are going to create - true, designs vary, but this is an excellent starting point. Perfect for the beginning & more experienced bead art jewellery designer. Also helps with understanding and knowing which gauge beading wire works best with a specific bead type. The Bead Oracle is credit card size reference tool that fits in your wallet.