Olfa 自動回縮安全刀

I was a bit skeptical about the safety feature, but after the first cut the blade snapped back into the handle so fast I didn't even have time to think about it. Feels solid in the hand, too.

I was a little skeptical about the spring mechanism at first, but after using it to break down dozens of boxes, the blade retracts instantly the second it loses contact, which makes me feel much safer on the job.

The spring-retraction is so fast and reliable that I never worry about leaving the blade exposed when I set it down. It's cut through thick cardboard boxes all morning without any slipping.