Specifications: Dimensions: 100×70 mm and 70×52 mm Material: FR4 glass fiber; Copper Thickness: 1.5mm Layers: Double-sided copper-clad, one-sided copper-clad. Glass fiber material FR-4 flame retardant. A few fingerprints could remain with super-fine steel wool. High intensity, good plasticity, not easy to bend, has good electrical conductivity. Widely used in DIY soldering, product development, experimentation, maintenance, production etc. Delivery: 5 x (70×52 mm) copper-plated on one side 5 x (100×70 mm) copper-coated on one side 5 x (70×52 mm) double-sided copper-plated 5 x (100×70 mm) double-sided copper plated Note: For technical reasons, some products may have slight scratches that are normal. This has no impact on use. If the scratches are severe, please contact us for a replacement or full refund. 100% satisfaction guarantee: We pride ourselves on offering the highest quality products. We offer a 100% MONEY BACK GUARANTEE! If for any reason you are not satisfied, we will immediately refund the purchase price.