This is a lens holder for meter stick optics. It comes with a piece of foam in the clip to prevent it from being bent in shipment. The metal is a little soft which allows the holder to be bent to shape but also means it can be bent out of shape. The clip is sharp but should be no problem for the right age student. If you buy the Optics Bench Kit, you'll want an extra lens holder to make telescopes and other multi-element optics demos.