weighs in at 59 g, Dimension: 123.23 mm x 67.85 mm x 16.77 mm
internal hard case separated from the rubber shield
Front part of case (left on picture above) : high impact non watermarks hard transparent screen
back part of case (middle): same circular screen for back apple logo and velvet internal preventing scratch
and rubber shield (right) : outer layer shock absorbers
My opinion : You compromise the bulkiness and weight for extra protection. This is by far The Best protection for your iPhone4 money can buy.
installation videos below
The finished product