[techedguy]

It is hard to convey in pics how cool it is to build stuff with these. Some of the connectors are ribbed to lock the angle, others are partially ribbed to allow a movable joint. They lock flush with the surface of the beam so as not to interfere with moving parts or adding parts on (unlike bolts/nuts) and the R/C motor that ships with the car model is faster than I would normally put in the hands of students (so of course they loved it).

You can break them...but my students were building jumps and driving the model really poorly when they did that "yeah, if you run any car into a concrete wall at full speed you just might break something kiddo". But usually it was one connector or beam that would break and it'd just be a few minutes until they did it again.