An Erlenmeyer flask is a type of laboratory glassware which consists of an inverted conical base with a cylindrical neck. The main advantages in an Erlenmeyer flask are that is less likely to tip over than a beaker and the smaller neck which slows evaporative loss.
Sometimes to anchor an Erlenmeyer flask, a 'C' shaped lead or iron weight will be placed over the outside, to keep the flask firmly planted.