DURABLE MATERIAL: The retainer case is made of PP, the plastic is strong and durable, won't crack or break, and can be used for a long time Bright colours: comes with 6 beautifully coloured retainer cases, dental tray case Pink + Yellow + Blue + Red + White + Green Retainers; Size: 8.5 x 8 x 3 cm / 3.35 x 3.15 x 1.18 inches Keep your retainer or denture clean: the holes in the mouthguard case allow for good ventilation, keeping your oral appliance dry and preventing bacteria from growing during storage Secure design: The mouthguard case has a tight locking mechanism so that your mouthguard cannot be opened accidentally. VERSATILE USE: These small boxes are perfect for holding retainers, earplugs, earplugs, etc.