These 3mm crimp beads are made of silver metal and of very good quality! dia. of the hole approx. 2mm. The cotton cord thread and the elastic that you will find in my shop adapt perfectly to it. - If you buy more than one item, don't forget to tell me ask for the total BEFORE paying by ebay messaging or email, because the reduction in shipping costs does not happen automatically, and ebay shopping cart not working well. - Communication is very important on ebay, it helps to avoid any small problems, there is always a solution to every problem ;) Items are carefully packaged in bags, bubble wrap if necessary, and taped in the envelope. Every order is important, small or large. My dear customers from Europe and around the world, if you want a tracked shipment, please ask me by email, I will.