Protect PK1 is a MIL-PRF-121 Type I kraft/polyethylene barrier material that’s waterproof, greaseproof, flexible, and heat-sealable. Built from 60 lb natural kraft laminated to polyethylene, it meets MIL-PRF-121G T1 specs to protect metal parts and equipment from moisture and corrosion in storage or transit Manufactured to MIL-PRF-121 TI specifications.   NSN 8135-00-233-3871. All rolls are shipped individually via UPS.  Please call 1-800-644-4032 for bulk pricing or freight shipping.