Material: 14K Gold Plated, Internal material: Copper Size: 6.0mm x 5.0mm Hole Size: 1.5mm Usage: Core end caps are excellent for wire knot cover, DIY bracelets, necklaces and decorations, jewelry making design Package includes: 200pcs 6x5mm U Shape caps Storage: Coming in an organizer box, easy to store and carry BEADIA 14K Gold Plated U Shape End Caps 6x5mm 200pcs for Jewelry Making Findings