The product is made of good material and durable. Simple appearance. They are large in quantity and easy to use. This product is water-absorbent, clean and dust removal.A versatile tool suitable for various experiments and cleaning tasks. Come and get one as you to do an experiment. Features -Color:As Shown -Material:Paper -Size:7.50X2.80X0.10cm/2.95X1.10X0.04in - This product can be a great gift for your friends and families who usually do experiments.- Made of good material, safe to use, suitable for chemistry and biology experiments.- A set of test paper strips is adequate for experimental use.Suitable for laboratories, research institutes, etc. - Great for cleaning the dust on your experimental lens.Easy to operate in your working time. - Multiple purposes: Designed for scientific experiments, it can be used for water absorption, cleaning, and dust removal. Packing list: 200 x paper strips