The metal peg board is actually quite heavy, so it feels like it will last a while. The clamp part (other than the knob) is also metal. The rectangular and cup container and the "phone" frame are plastic. The other parts are also metal-based.

As advertised. Very sturdy and useful.

Top quality product. Very sturdy

My kid loves it and it fits perfectly. Great add-ons.

Though these are marketed as an accessory for the desk pegboard, they are amazing as fridge magnets since they are so easy to adjust.

Extremely sturdy and can support a lot, even a heavy textbook.