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! The large 7.5" long large rocket with a 2.4" diameter blows a large volume of air to dislodge stubborn dust particles. All 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!