The GC ELECTRONICS 21-247 is a bare copper circuit board designed for a range of electronic applications. It features one ounce (0.0014") of copper on a base of either FR-4 (G-10) fiberglass or CEM-1 type epoxy reinforced board, with a thickness of 1/16". This board provides a stable platform for circuit design and fabrication, commonly used in prototyping and low-volume production runs. Its robust construction and standard dimensions make it a versatile choice for engineers and hobbyists alike.