🔧 Build Your Dreams, One Board at a Time! Durable FR4 glass fiber material with 1.6mm thickness ensures a robust prototype. 5 different sizes to perfectly fit your Arduino projects and electronic experiments. 4 convenient mounting holes for seamless installation and stability. Pre-tinned plated holes for quick and easy component soldering. 32 meticulously crafted double-sided PCB boards to fuel your DIY passion. 32 pcs 4 mounting holes 5 sizes The ELEGOO 32 Pcs Double Sided PCB Board Prototype Kit is designed for DIY enthusiasts and professionals alike. This kit includes 32 high-quality double-sided PCB boards in 5 different sizes, perfect for Arduino projects and electronic experiments. Each board features 4 mounting holes for easy assembly and pre-tinned plated holes for hassle-free soldering. Made from durable FR4 glass fiber material, these boards are built to withstand the rigors of prototyping.