recommend giving him a military badge.
After your brother has passed the coming-of-age ceremony, he has become an adult in the true sense, or he can be considered a man. Boys of this age have a heroic dream in their hearts. Military-style things can just satisfy this heroic dream.
So I recommend giving him a military badge. This military badge is made of tungsten steel, with a full metallic feel, reflecting the masculine and avant-garde side. When my brother was admitted to university last year, I gave him this gift, and he liked it very much and has been wearing it until now.
This military badge is not very troublesome to make. It can be customized online. It is very simple. You just need to send your brother's name and the store will engrave your brother's name on it. It is very individual, and this gift can be said to be unique in the world. As for the chain of the military badge, I recommend choosing an imported leather rope. Young people generally like this.