Feature: Copper material will not rust; Ultra-thin, space; 20mm width, to accommodate a variety of tie. Specification: Material: Metal CopperColor: blackSize: 20mm(ID)inner diameter:18mmOutside diameter: 23mmNo rust, thin, DIY tie.For Bow Tie,DIY.please confirm the size before you buy.Package include:50x Bow Tie ClipsNote: Please allow 1-3mm error due to manual measurement. Thanks for your understanding. .wang-edit-text{ font-family:'Arial' important; } .wang-edit-text table { border-top: 1px solid 000; border-left: 1px solid 000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid 000; border-right: 1px solid 000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }