Lockdown Rechargeable Silica Gel 40g 5-pack Blue. Crystals change color once fully saturated and can be easily recharged in the oven. Specifications for Lockdown Rechargeable Silica Gel 40g: Manufacturer: Lockdown Color: Blue Fabric/Material: Silica Weight: 40 g Quantity: 5 Features of Lockdown Rechargeable Silica Gel 40g Absorbs Moisture from the Air Individually Wrapped 40 Gram Silica Bags Ideal for Handgun Vaults Ammo Cans and Gun Cases Recharges in the Oven Changes from Orange to Blue when Recharge is Needed Package Contents: Lockdown Rechargeable Silica Gel 40g Lockdown 1138993: Rechargeable Silica Gel 40g 5-pack Blue