As of 2019, foldable smartphones have displays made out of flexible plastic, however, companies are working to replace flexible plastic with foldable glass, with the potential advantages being the elimination of the crease and increased scratch resistance but with the potential disadvantage being a trade-off between impact resistance (how much force the glass can withstand without cracking) and bending radius (how tightly the glass can be bent without cracking). A smaller bending radius (for say, a thinner-than-normal foldable smartphone) requires a thinner glass sheet that, due to its reduced thickness, does not have as much impact resistance. This could potentially mean that foldable smartphones with glass screens could break easily when dropped while unfolded.