6 SENTRY ALARM MINES .22 Cal trip wire alarms for PREPPER Property Home Security, Poachers Farm and Ranch Door and Gate Outdoor Security Airsoft Paintball Safe to use .22 Cal Blanks available at any Hardware Store or Amazon.com 100% Steel Construction made in the U.S.A. Featured "Prepping 101" product by Guns America As seen on American Restoration with David Copperfield