Kesh is not manufactured, it is the hair itself left uncut for life, but maintaining it involves a real, taught craft, tying the turban, dastar, that covers it, and that skill is passed down within families rather than picked up casually.
A length of cloth, and a learned technique
A dastar is typically four to six meters of cotton cloth wound around the head in a specific sequence, with distinct regional and community styles of tying, and children are taught the technique by parents or elders over years of practice rather than learning it from any written instruction. The cloth itself is an ordinary textile, the skill is in the folding and winding, which takes practice to do neatly and to hold through a full day.
Who is required to keep it, and how the hair itself is treated
Uncut hair is required of all baptized Khalsa Sikhs as one of the Five Ks, and in many observant households, hair that falls out naturally during combing or washing is gathered and disposed of respectfully rather than treated as ordinary waste, a small daily practice that extends the same regard given to the hair while it remains on the body. Sikhs who do not maintain kesh, whether never baptized or having chosen to cut their hair, are not treated as having damaged an object, since kesh is a personal bodily practice rather than a manufactured item with its own separate custody question.