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.Best ideas for /bar/wedding/ events. Decorate your Bottle & drinks with beautiful light. Easy To Operate: Take out the insulating sheet and tear off the glue on the , stick the LED coaster to any normal bottle or drinking glass,and press the ON/OFF button, you can see light up bottles or led drinking glasses immediately. There are 3 modes to choose from: rapid flash, slow flash and steady mode. Occasions: The round LED coasters can meet your needs in different occasions, such as parties, dating, family gatherings, annual company meetings, KTV, bars, cafes, disco clubs, slow clubs, leisure clubs, clubs, parks, gardens, restaurants, etc. Our bottle led lights for liquor bottles are sure to please you! Colour:As Shown Material:Plastic+Electronic component Package Contents: 50x LED lighted wine tray Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.