Simply the safest and best way to blow clean, dust-free air to clean lenses, cameras, filters, keyboards or any of the other places where dust resides! All models are made from the best quality silicon rubber for long life and instant rebound to deliver almost a continuous stream of clean air! Each rocket has a long thin tip with a uniquely designed opening to eliminate whistling. A one-way valve on the bottom brings in clean air and does not re-distribute the dust!