Cool Gear 6 Glow in the Dark Eyeball Ice Cubes (Non Toxic Gel) Serve Chilling Drinks Cool Gear 6 Glow in the Dark Eyeball Ice Cubes Freezer Gel inside (Non Toxic Gel) Serve Chilling Drinks great for parties freeze for 4-6 hours or until gel is frozen entire tray can be frozen at once Hold up to fluorescent light for 30 seconds, this will allow glow to charge Repeat to recharge ice cubes for continued use