KAI Rotary Cutters are the brand name. The most popular size is the model RS- 45 which is a 45mm and it's also available in the RS - 60 which is a 60mm. Yes, I did a lot of research before choosing to sell this brand of cutter only in my online store. They are the safest cutter that I have come across, and they're made in Japan! There are a number of dangerous cutters are the marketplace today.
Happy Scissoring,
Scissorman