48PCS Double Sided PCB Board Kit DIY Soldering Electronic Project Prototype Color: Multiple Colors Product Dimensions: 0.79"W x 3.15"H Double-Sided PCB Board Kit: This set contains 11 double-sided prototype PCB boards suitable for DIY soldering and electronic projects, and is compatible with Arduino kits. The sizes included are: 3 pieces measuring 20x80 mm, 3 pieces measuring 30x70 mm, 2 pieces measuring 40x60 mm, 2 pieces measuring 50x70 mm, and 1 piece measuring 70x90 mm. Screw Terminal Blocks and Jumper Caps: The kit provides 6 pieces of 5.08-301-2P screw terminal blocks and 4 pieces of 5.08-301-3P screw terminal blocks. It also includes 15 standard 2.54mm pitch circuit board jumper caps in 5 different colors, with 3 caps of each color. Header Connectors: All headers feature a 2.54 mm pitch. The set contains 4 pieces of 40-pin male headers, 4 pieces of 40-pin right-angle male headers, and 4 pieces of 40-pin female headers. Material: The boards are constructed from durable FR4 glass fiber material with a thickness of 1.6 mm. Application: The double-sided circuit boards come with tin-plated holes for soldering DIY electronic components. Mounting holes are positioned at the board corners for easy assembly and installation.