We refuse to compromise on the quality of our celluloid frames.
Our celluloid frames, which boast strong shape retention, beautiful polish, and a perfect f it, are beyond comparison. Yet, since there is a risk to catch f ire at temperatures exceeding 170ºC, they cannot be machine-manufactured and must be hand-made by skilled craftsmen.
Our craftsmen carefully choose the thickness of each frame using their experience and expertise, so that our frames' thickness varies even within the same model depending on the model's color and other conditions.

We slightly bend the celluloid plate after cutting it out.
We dip the plate into our special highly heated oil to pressurize it, and then cool it down immediately. The decisions of when and how are left in the hands of our craftsmen who have amassed an abundance of skill throughout their many years of experience.

Since this phase of punching out the lens holes has a risk of fire, this process also cannot be mechanized.
Our hands-on craftsmanship remains a necessity. Our craftsmen punch out the lens holes from bended celluloid plates one-by-one, and then dig V-shape ditches for the lenses.

After punching out the holes for the lenses, we then punch out the frames.
What started as a simple celluloid plate, has now transformed into P-501’s basic shape.

It is not possible that all of our nose pads will be placed in the same position, because the best position varies depending on each model.
First, we place the basic molds of the nose pads and then leave them for a few days. After they are applied to the frames completely, our craftsmen manipulate them by hand according to the shape of the model.
This process will define the first impression of comfort of our products.

This is the highlight of the manufacturing process of celluloid frames. Our craftsmen rasp the cut-out fronts one-by-one.
Utilizing their experiences, passions, and intuitions, they make the detailed nuances such as f luent curves and sharp, yet soft, edges that are impossible to bring out by machines. This is the moment that our products’ shapes and subtleties can be seen.
Like frames, the temples will be rasped by hand, as well.It is safe to say that there are almost no brands that rasp temples, other than BJ.
This unseen additional process brings a smooth fit and touch.

We put abrasive compounds and chips to our special rotary drum called "Gara", and then insert the frames and temples, separately.
The composition of abrasive compounds and chips are top-secret and classified, but we change the composition depending on the temperature and the season.