Filled Light Centers come with 4, 10 or 20 SnapLight lightsticks, plus a replacement supply of 4, 10 or 20 lightsticks. Each Lightstick produces four hours of safe, chemical light upon activation. 4- and 10-Stick Centers are made of fire- and blast-resistant steel. All Lightsticks automatically activate and are ready for use upon opening the station. 20-Stick Centers are made of industrial-strength plastic. One SnapLight activates upon opening the station. Simply bend, snap and shake to activate the remaining Lightsticks as needed. Refill Kits sold separately.