The sponge tips are wear-resistant and can be used with most solvents, including acetone. These industrial cotton swabs are ideal for maintenance cleaning in various industrial and manufacturing applications, including precision equipment, electronic devices, electronic components, various circuit boards, optical equipment, optical fiber-related parts, and various lenses. They are small, easy to carry and store, user-friendly, and have excellent performance. They absorb dirt and dust without causing scratches, making them suitable for a variety of items, from precision machinery to plastic models. They are also perfect for removing dirt accumulated between keyboard keys. Unlike cotton swabs, they do not leave fibers behind. Recommended for leathercraft: Due to the sponge's excellent absorbency, it absorbs pigments well, making it suitable for evenly applying edge paint thinly. * You can apply it evenly while lightly touching the edge surface. Size: Total length 110mm, Quantity: 100 pieces