So, yes, they are. The problem with them is that they take significantly less force to break glass... Whoever is using them must be quite careful with where they are firing.
The other problem with them is that B3ANZOR is a member of Rebel Union, and Rebel Union often hosts games at Fightertown. Since they have many vehicles with untinted and old glass on that field, it might not be a good suggestion to use them there because broken glass on an airsoft/paintball field is far from desirable.