300 UNITS OF BOTTLE STRAP TAGS. Good for double door 6 feet wide detection. Features: Can be used on both AM and RF system. Extra protection to lock your valuable wine bottles with adjustable strap made of steel plate inside which is very difficult to cut. JUMBO size sensor tags make detection easy ( up to 6 feet wide ). Mechanism : magnetic locking . Need to use a magnetic detacher to release. Shop to all U.S 50 states with fash USPS Priority shipping service. Call us to but the strong Universal Magnetic Detacher (909)592-8881