The cool thing about these nunchaku is that you get the overall idea of the functional purpose of nunchuk practice without the lethality of something like metal or wooden nunchaku. They are fairly light, and the cord design is sturdily anchored fairly deep into the core of the interal plastic, not attached directly to the foam, which is good. The cord itself is sturdy, and I would argue that the nunchuks would hold up alright in a sparring match (haven't tried that yet). The only thing I think I would say is that the bane of the design is in the plastic core. It's fairly weak, and it depends on the absorption of the foam rubber. If you intend to use these, do NOT strike them hard on a surface. My brother broke a similar pair on a birdbath, hence he's not allowed to touch these.

Overall I'd say they're great and the price is right. If you are looking for serious sparring weapons, perhaps they are not made for that challenge, but for practicing kata with nunchaku and getting the overall feel without beating yourself unconscious, they're a pretty good choice.