Praise be to Allah.
It is not permissible for men to wear bracelets, whether they are made of leather, metal or any other material, and it is not permissible to sell them to men, because bracelets are adornment for women, and imitating them in that is haraam (for men).
Al-Bukhaari (5435) narrated that Ibn ‘Abbaas (may Allah be pleased with him) said: The Messenger of Allah (blessings and peace of Allah be upon him) cursed men who imitate women and women who imitate men.
According to a report also narrated by al-Bukhaari (5436), the Prophet (blessings and of Allah be upon him) cursed effeminate men and masculinized women, and he said: “Expel them from your houses.”
Shaykh Zakariyya al-Ansaari (may Allah have mercy on him) said:
A man may wear a silver ring to follow the example of the Prophet (blessings and peace of Allah be upon him) on the basis of scholarly consensus; in fact it is Sunnah to do so, as we have seen above. … But wearing bracelets and some other things such as bangles and necklaces is not permissible for him even if they are made of silver, because that is a kind of effeminacy that is not befitting for dignified men. End quote from Asna’l-Matalib, 1/379.
Ibn Hajar al-Haytami (may Allah have mercy on him) said:
It is haram to imitate them (i.e., women) by wearing fashions that are unique to them, such as wearing bracelets, anklets and the like, unlike wearing rings. End quote from al-Fatawa al-Fiqhiyyah al-Kubra, 1/261.
So it is not permissible for you to sell bracelets to men at all.
It is permissible to sell them to women, subject to two conditions:
1.. That you do not sell them to someone who you think most likely will make a wanton display of wearing the bracelet and uncover her wrist.
The Permanent Committee were asked: what is the ruling on dealing in women’s adornments and selling them to one whom the seller knows will wear it by way of wanton display in front of non-mahrams in the street, as he can tell from what he can see of the way she appears, and as is a very widespread problem in some regions?
They replied: It is not permissible to sell it if the seller knows that the one who buys it is going to use it in ways that Allah has prohibited, because that comes under the heading of cooperating in sin and transgression.
But if he knows that the purchaser will use it to adorn herself for her husband, or he does not know anything, then it is permissible for him to sell it to her." (Fataawa al-Lajnah ad-Daa’imah 13/67).
2.. If the matter is free of any corrupt beliefs
We do not think there is anything wrong with what you mentioned about calling the bracelet a planet bracelet, or a bracelet with the names of the planets, so long as you do not promote false beliefs, such as claiming that the bracelet can have an impact on a person’s happiness for example, or that it can bring good luck, or that the one who owns it owns the planets in a real sense! Or that the sun has an influence on the planets, as is the belief of many idol worshippers who regard the sun as divine.
If the matter is free of false beliefs, whether these beliefs are widespread among the people or you are the one who is propagating them with your product, then there is nothing wrong with selling the bracelets to women, subject to these two conditions.
And Allah knows best.