PEPPERLONELY Brand 100 Sets Copper Metal Snap Fastener Button Round Silver Tone Quantity: 100 Sets Size: 10 x4mm( 1/8") 10 x5mm( 2/8") 9 x3mm( 1/8") 9 x6mm( 2/8") Hole size: 2.1mm( 1/8") Thickness: 5.8mm 5.1mm 3.8mm 3.3mm Material: Copper(Lead and Nickel Safe)