.Affordable long lasting Paddle will not scratch plastic fermenters. Made of durable FOOD GRADE plastic. BPA free. Very smooth and easy to clean. Opposite end has a small paddle with a hole that will fit into a carboy or gallon jar, to allow stirring inside them. Maximum Temperature: 97 °C It is very important to make sure your brew is well stirred and "aerated" before the yeast is added. If not well stirred then yeast growth will be retarded and brews will not ferment as well as intended. Stirrer should always be cleaned and then sterlised before each use.