Ultra-thin Design: The light up drink coasters are made of laminated foam core board with only 0.118inch adhesive layer. The disc is flat,light and stable,and will never affect the normal use of the container. 24+Hours:Each bottle coaster comes with 2*CR2020 batteries (included and installed),working for 24+hours,and can be used in bars,home bars,wedding centers,various parties,glass,booze shelf,vase,bottles and night disc golf. 3 Flashing Modes: The light coasters for drinks have 4 super bright Led lights and 3 flashing modes,fast flash,slow flash,and steady mode. Easy to Operate:Just stick these light up coasters on any normal bottle or drinking glass,and click the button to turn on. Light color:blue Colour:White Material:EVA Size: 6cm Package Contents: 36 x Sticker Lights 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.