What is this? Widely used for shipping, warehouse handling, warning, caution sign or workplace etc What will I get? Size：100 x 100mm/3.9 x 3.9 inch;Pack of 50pcs sticker; with words"9" Is there any advantages of the product? Made of vinyl material, bright color printing, sticks to any surface like Cartons, boxes, pallets, cardboard, glass, and paper, etc How to use it? Self-adhesive, easy to use, just peel and stick. What should I notice? Due to the manual measurement, the product has an error of 0.2mm.