It ensures ample protection. Paper GSM (Thickness) 70 GSM 70 GSM 70 GSM 70 GSM 70 GSM 70 GSM 70 GSM. Coverage Area 35 sq ft 55 sq ft 150 sq ft 250 sq ft 375 sq ft 500 sq ft 625 sq ft. Stretchability Expands upto 56 sq ft Expands upto 88 sq ft Expands upto 240 sq ft Expands upto 400 sq ft Expands upto 600 sq ft Expands upto 800 sq ft Expands upto 1000 sq ft.