Inner diameter: 3.9 inches (10 cm) / Total length: 13.4 inches (34 cm). Genuine stainless steel that can withstand most external conditions and last 200 years. No worry about the service life, high tightness, pressure, low temperature resistance, high temperature resistance, not easy ageing. Silicone seals at both ends ensure a good seal of the capsule, keeping any moisture away. Baby First Birthday Time Capsule Box Open 18th Birthday As shown in the picture. two silicone seals and all the accessories needed to assemble this time capsule.