"PREDATOR GRADE BLADES" Mystic Blue Credit Card Knife -- The Folding, Ergonomic, Tactical, Survival Knife That Fits in Your Wallet. New for 2016! ULTRA THIN - Survival Knife That Fits Into A Credit Card Wallet Sleeve. LIGHTWEIGHT - About 25 grams - You'll Forget You're Carrying A Knife. DURABLE - Steel Handles Retain Rigidity If The Going Gets Tough. MYSTIC BLUE - For The Mystic VooDoo That You Do!