The Spectra Duckbill Valve White Set of 2 is a silicone valve designed for breast pump parts. With dimensions of 2.60 inches in height, 4.65 inches in length, and 3.07 inches in width, these valves are lightweight, weighing only 0.020 lbs each. The white color makes them easy to clean and maintain, providing a convenient solution for nursing mothers looking to efficiently pump and store milk.