Review on Stay Safe on the Road with Lenmumu Safety Triangle Kit: Foldable 3 Pack of Roadside Reflective Early Warning Signs by Chris Munns

Made from light weight cheap plastic with plastic flag material (like watering flags), they are not stable and will be blown away by the slightest breeze. They were easy enough to set up if you're careful and have good lighting, which you can't do on the street at night. They may convey a sense of security and readiness, but that will be wrong. They fold into a compact package that's easy to stow in the car, but I'll be returning them and taking a closer look before looking for a replacement.