Which types of samples are the sheet-like grips indicated for?

These grips have been designed to apply tension loads on the samples, as well as the rod-like grips. However, these grips have been conceived to be used with planar samples like sheet-shaped tissues or membranes (e.g., skin).

Moreover, it is worth noting that these grips maintain the sample very close to the bottom glass window so the visual inspection is made possible.