Dry & Dry 500 Gram Pack of 10 Premium Silica Gel Packets Desiccant Dehumidifiers - Rechargeable Fabric Packet dimension : 5" x 9", Silica Gel Beads Size : about 2 ~ 4 mm Premium Quality (30 Year Experience in Silica Gel Desiccant) - Pure Silica Gel without Cobalt Chloride. NO RISK Pure Silica Gel without Cobalt Chloride & Packet Material is Special Fabric by Spunbond Technology for "Ultimate Moisture Absorption" and "Heat Resistance for Reuse". Packets can be Reactivated by Placing in the Oven for 0.5 -2.0 hours at 200-250F Or Microwave for About 10 Minutes at DEFROST. Don't use over 250F in the Oven. Depending on beads' condition, they may take shorter than the recommended time. Packets are stored in Box