A. The set has 20 tags in 8 different colors. It can be used as a classification system for labeling multiple items, like keychains, suitcases, USB drives, etc. B. Each tag has a blank piece of paper for writing and comes with a sturdy transparent envelope that is waterproof and dustproof. Items can be classified easily through color coding and label annotation. C. It measures about 2.2 inches in length and 1.15 inches in width. You can attach them to items with split rings. They are convenient to carry without adding much extra burden or bulk. D. Made of heat - resistant and wear - resistant polypropylene, it is relatively sturdy and durable and not likely to break. The corners are rounded to avoid accidental scratches. E. There's no need to remove the split ring. Just press the envelope to open it, take out the paper, and write. After the ink dries, insert the tag into the case to prevent soiling.