It's a 2cm x 8cm High Quality Double Sided General Purpose PCB Zero Board. This Is A High-Quality Double-Sided FR4 Glass Fiber General Purpose PCB. It Is Used For Rapid Prototyping Design. 

Features 

• Actual size: 2cm x 8cm (0.79 inches x 3.15 inches)
• This Is A High-Quality Double-Sided FR4 Glass Fiber General Purpose PCB
• It Is Used For Rapid Prototyping Design
• The plated holes are pre-tinned/pre-coppered and very solid, making them very easy to solder components on.
• Widely Used For Electronic Projects.
• This is commonly known as Perf Board, Practice Board, General Purpose PCB, and Zero Board. 

Specification