Our trademark "Bellstone" is made by distinctive manufactures process and will make the products where the customer demands with continuous development and test spirit. Further more, we will try to become the best enterprises in the relation industry.

1. Material warehouse
2. Blending
3. Formation
4. Kiln
5. Quality control
6. Finishing process
7. Packing
8. Laboratory
9. Microscope photographing

In the precision processing field, like as car, semiconductor, air craft etc. Yeonjisa will lead the precision processing field by our innovative manufacture process and excels.