Durable material: each foam swab head is made from open‑cell foam, which is securely bonded to a poly shaft, not easy to come off.Proper size: The cleaning swab measures 3.11 inches long. The foam tip is 0.18 inches thick and 0.43 inches wide, convenient for use and carry.Good helpers for cleaning: these foam swabs are suitable for various occasions. Round tips perform well on different electronic components.Compatible with most electronic components, these foam cleaning swabs work for printers, computers, optical instruments, camera lenses and solvent‑based printheads.Large quantity: You will receive 100 pieces of 3.11‑inch cleaning swabs, sufficient for your daily maintenance needs.