Material: Bar coasters are made of laminated foam core board, the discs are flat, stable, and slightly cushioned. Each light up coaster has 2 CR1220 button batteries (installed in the product in advance). Feature: Each LED coaster has 4 LEDs neatly reflected and amplified through the clear vessel & liquid. Ideal for parties, bars, weddings, and events. Decorate your bottles and drinks with beautiful lighting effects. Easy To Operate: Remove the insulating sheet and peel off the adhesive, then stick the LED coaster to any standard bottle or drinking glass. Press the ON/OFF button to instantly illuminate bottles or drinking glasses. Three modes available: rapid flash, slow flash, and steady mode. Ocns: The round LED coasters are suitable for various ocns such as parties, dates, family gatherings, company events, KTV, bars, cafes, disco clubs, lounges, leisure venues, parks, gardens, and restaurants. These bottle lights are perfect for enhancing the ambiance of any setting. Color: As shown Material: Plastic + Electronic components Package Contents: 50 x LED Lighted Wine Tray Note: Light reflection and different display settings may cause slight variations in color between the image and the actual item. Measurement may vary by up to +/- 1-3 cm.