The device vent indicator sticker is made of PP synthetic paper material, which is safe and gentle, durable and can serve you for a long time. Made of excellent craftsmanship, it is safe and reliable, easy to paste, has strong adhesion, and is not easy to fall off, which will bring you a better experience. It's simple in design, but very eye-catching, can play a good reminder effect, and will be your good sticker choice. Features -Color: Blue. -Material: PP Synthetic Paper. -Size: About 4.00X4.00X0.10cm/1.57X1.57X0.04inch. -Easy to paste, stable and practical, not easy to fall off, it is a prompt sticker with performance. -Clear and bright, easy to understand, can be widely used in warehouses, offices, schools and factories. -The device vent sticker is efficient and practical, eye-catching and durable, and can be easily applied for your convenience. -Made with craftsmanship, it is not easy to tear, safe and practical, can serve you for a long time, and will not be easily smudged. -It is simple in design, but very practical to use, giving you a good experience. Package list: 20 x warning stickers