the back and front is made of special glass similiar to sapphire glass ... hence i think it should be more scratch resistant and stronger ....

the glass is aluminosilicate glass , normally used in windshield of helicopter and high speed train

shud be quite hard gua .... erm , ya more scratches resistant , not proof , well , not like u want to purposely scratch it >.<

i wonder if the glass will break if fall on floor

but since there is IS for both side, imagine screen protector on both side ....
wun that mean we have a mirror finish both side O.O

ya but a nice cover is better for protection