Pack of twelve, multipurpose policeman-style stirring rods made of high quality polypropylene. Feature spatulas of different widths at each end – 0.5″ and 0.3″ wide. Stir rods measure 9.75″ in total length, and 0.2″ in diameter. Designed for use in professional laboratories, but is an ideal choice for science classrooms and household use. Autoclavable, with superior chemical durability and heat tolerance. Can withstand temperatures ranging from -20°C to 135°C.