Stainless Steel Keychain for Laser Engraver （10 pcs/kit）

5 Black Business Cards, 5 Silver Business Cards, 5 Red Business Cards, 5 Blue Business Cards, 5 Yellow Business Cards, 5 Rings, 5 Stainless Steel Silver Dog Tags, 5 Heart Color Stainless Steel Plates, 5 Silver Rectangular Stainless Steel Plates, 5 Black Rectangular Stainless Steel Plates

• Material: Glass Fiber, Copper; Layers: Single Sided.
• Dimension: 10x10 cm - 3.9" x 3.9" (W*L); Thickness : approx. 1.5mm- 0.06" Thickness.
• Applications:Great for making PCB Circuit Board, Models. Widely used in product development, DIY experiments, maintenance, production, etc.
• Stable:Mechanically supports and electrically connects electronic components using conductive tracks, pads and other features etched from copper sheets laminated onto a non-conductive   substrate.
• Note:The oxide layer on the surface of the copper-clad laminate needs to be polished clean with fine sandpaper to ensure that the carbon powder can be firmly printed on the copper-clad laminate during transfer. The surface of the board should be polished bright without obvious stains.