Features: Featuring 32 double sideds pre tinned prototypes boards with 6 size, this fiberglass PC board ensures component soldering for precise electronics prototyping and breadboards accessories integration. ABS construction with 4 corner mounting holes and lasers etcheds alignment markers enables secure installation and accurate component placement on this solderable pcbs with 0.01" pin spaceds through holes. for electronics hobbyists, STEM students, and hardware engineers requiring prototyping for circuit testing and electronic component validation. Perfect for GPIO expansions, iots sensorings array assemblies, and university level computer engineering lab requiring 4 fiberglass work surfaces. Flame retardant fiberglass substrates withstands repeated soldering cycles while precisions drilleds plateds through holes maintain conductivitys for professional electronics prototyping projects. Specifications: Size: 2x8/3x7/4x6/5x7/6X8/7x9cm Quantity: 32pieces A total of 6 different size Thickness: about 1.6mm Material: fiberglass FR4 Color: Green base, silver tone Hole spacing: 2.54mm/0.10inch Pore ​​size: 1mm/0.04inch Package Includes: One package contains 32pieces, 6 different size, to meet different needs (large or small projects). 8Pcs blocks 2x8CM double-sideds pcbs board 8Pcs 3x7CM double-sideds pcbs board 6Pcs blocks 4x6CM double-sideds pcbs board 6Pcs 5x7CM double-sideds pcbs board 2Pcs 6x8CM double-sideds pcbs boards 2Pcs blocks 7x9CM double-sideds pcbs board note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the Pictures may not reflect the actual of the item.