Voltera PCB blanks The FR4 blanks are printed circuit boards for the Voltera V-One. They are made of epoxy laminate and are reinforced with glass fibers. The material itself is flame retardant. If you want to drill holes, we recommend the FR1 printed circuit boards. Unlike the FR4-, the FR1 dust does not contain glass fibers that can be harmful to the lungs. It is also a softer material, which means less wear on the drill bit. The boards are available in different sizes and materials: https://elecena.pl/product/19725488/1000066-voltera-pcbs-76-2-x-50-8-mm-fr-4 2021-10-25 https://elecena.pl/product/19725488/1000066-voltera-pcbs-76-2-x-50-8-mm-fr-4 2022-06-03 https://elecena.pl/product/19725488/1000066-voltera-pcbs-76-2-x-50-8-mm-fr-4 2022-08-23 https://elecena.pl/product/19725488/1000066-voltera-pcbs-76-2-x-50-8-mm-fr-4 2022-10-27 https://elecena.pl/product/19725488/1000066-voltera-pcbs-76-2-x-50-8-mm-fr-4 2023-03-19 https://elecena.pl/product/19725488/1000066-voltera-pcbs-76-2-x-50-8-mm-fr-4 2023-04-17