ALTTIMERY Mini Brass Waterproof Holder Case Outdoor Emergency Portable Survival Gear Container EDC Kits with Key Ring Material: solid brass Size: 61mm - length; 12mm - outer diameter; 9.7mm - internal diameter Fully air-tight and waterproof, keep things always dry and tidy Ideal for outdoor survival to store medicine, matches, fire-starter, batteries, and other survival valuables With Spare O-ring