The PYREX Glass 1000mL Erlenmyer Flask is a high-quality lab glassware product made in the United States by the well-known brand Corning. This specific model, 4980-1000, is designed for precise and accurate measurements in a variety of laboratory settings. With a capacity of 1000mL, this flask is ideal for mixing and measuring liquids in medical, research, and educational contexts. Its durable construction and reliable performance make it a valuable tool for professionals and students in the field of science.