Top grade dessicant silica gel is contained within a compact aluminum canister. Provides lifetime protection and has a built-in indicator that turns from blue to pink to signal the need for reactivation. Easy to reactivate in any oven. Hydrosorbent Dehumidifiers#: SG-40. Size: 4x2x1.5. Color: Aluminum. Sold Individually. Case Qty: 240 .