The Weatherproof Silver Polyester (SP) has a facestock caliper of 2.0mil ± 10% with a facestock weight of 56 lbs per ream ± 10%. The liner weight is 56 lbs per ream ± 10% and the liner caliper is 3.0mil ± 10%. The total caliper is 5.5 mil ± 10%.