This set exists because the five-element idea is the reason most people arrive at this site, and a gift is the most common reason to buy something you would not buy for yourself. Rather than bundle a bracelet with unrelated objects, the set pairs one bracelet with the one thing that bracelet is about.
On the card: it is a printed explanation, roughly 200 words, covering where the five-element scheme appears in Chinese sources and what each element is traditionally associated with — wood with growth, fire with warmth, earth with steadiness, metal with structure, water with depth. It does not tell anyone that a bracelet will change their circumstances, because that would not be true and we would be selling you a falsehood in a nicer box.
The element is chosen at checkout. If you have taken the Five-Element Test, the result page names the element and links straight here.