Durable material: each foam swab head is made from the open-cell foam, which is securely bonded to a poly shaft, not easy to come offSize information: the foam tip is approx. 3.66 inches/ 93 mm in length, it is very convenient for you to use and carry when traveling, or night camp, go out etc.Good helpers for cleaning: these swabs sponge sticks are suitable for various occasions, round tips work well for various electronic componentsFit most electronic components: these foam cleaning swabs can be applied to clean printer, computer, optical instrument camera lens, and even can be applied to clean various solvent printheadLarge quantity: you will get 200 pieces cleaning swab sticks in 3.66 inches, enough quantity to fulfill your daily needs Product Description They do not leave any residue behind like regular cotton swabs do. The foam head stay perfectly intact and will not fall off. Leaves Behind No Residue Lint-Free They are lightweight, simple, and easy to use. They are perfect for small spaces and areas that you cannot get into with a rag or other cleaning objects. Ideal foam swab for any cleaning and detailing solution. Washable and reusable. Foam heads that are gentle on delicate parts. Camera sensor cleaning swab. laboratory optical equipment cleaning. Apply solvents, adhesives, sealants, paint, lubricants, or to clean parts and equipment.