Kumlais aren't made by monks, but by local communities for the temples that purchase them. Thai monks don't work, apart from maintaining the monastery and temple.

Originally, Kumlais aren't blessed. To be blessed, they must be obtained during a blessing ceremony at the temple. For those found online claiming to be blessed, this requires taking them to a temple for a mass blessing, which is not considered to have much value by practitioners. Personally, I don't do this for the Kumlais I sell because I'm not a religious Buddhist. It makes me uncomfortable, and I believe the same applies to most of my customers, who also aren't Buddhist. However, I will happily arrange for a Thai Buddhist person to have a personalized blessing ceremony done for your Kumlais (see below).

Kumlais are Thai, not Tibetan.

Most Kumlais found online are manufactured in China and sold by wholesalers on Alibaba worldwide. They're sometimes filled with glitter rather than gold leaf, sometimes just paint which is why some smell of chemicals (authentic Kumlais have a pleasant scent or no scent). They sometimes come with certificates, sacred mantras, and other guarantees. These practices are typical of Chinese manufacturers to give credibility to all the products they copy. These bracelets also lack the durability of the originals, having a tendency to separate or breaking at the connector.