The Velocity Systems Bicep Protectors offer Level IIIA protection for your biceps. They attach to theLow-Profile Armor Carrier (LPAC)and theLow-Profile Assault Armor Carrier (LPAAC). 33A Dyneema Ballistic Specifications NIJ Ballistic Model No: VS-33A NIJ Certified: Type/Level III-A Ballistic Material: 100% Dyneema Ballistic Panel Thinness: .22 inches Weight: .99 lbs./sq.ft Fragmentation: Meets/Exceeds USSOCOM & IOTV requirements 06 Aramid Ballistic Specifications NIJ Ballistic Model No: VS-63A1 NIJ Certified: Type/Level III-A Ballistic Material: 100% Aramid Ballistic Panel Thinness: .27 inches Weight: 1.18 lbs./sq.ft Fragmentation: Meets/Exceeds USSOCOM & IOTV requirements Velocity SystemsModified Shoulder Sleevesare necessary to adapt the LPAC and LPAAC to work with the bicep protectors. All hook and loop material used is color matching Velcro Brand Fasteners. All materials and workmanship are 100% made in the USA.