The rubber bulb, also known as the ear aspirator, etc., is mostly made of rubber and other materials, and is spherical with a tube. It can be used for medical ear cleaning, laboratory liquid transfer or instrument cleaning, and can also be used to remove dust from keyboards and other items. When using it, be careful to avoid contact with acids and alkalis. Squeeze it flat and insert it into the pipette to draw liquid. It should be stored clean and dry.