Description If you are looking for a weight ring for erlenmeyer flask, reliable and reasonable price, I will tell you that our erlenmeyer flask weight ring will be your best choice. We adopt high- plastic and iron material, so you can keep it for a long time. Suitable for students and teachers when they are doing experiments in chemistry class. Features - Color: Random color. - Material: Iron, plastic. - Size: 8.50X8.50X2.00cm/3.34X3.34X0.79inch. - Constructed by using high-grade material, ensures it safety and can use it with confidence. - Suitable for beginners or professional use, easy to wash and maintain. - Suitable for students and teachers when they are doing experiments in chemistry class. - Professional and practical design with beautiful appearance, easy to carry and use. - It saves space and is easy to store, which will not take up much space.Package list: 2 x Weight Rings