Jeweler's Genuine Rubber Bulb Dust Blower - Gentle Air Cleaning Classic jeweler's tool for gentle cleaning air blast Genuine rubber bulb with one-way steel air valve, squeeze for air jet, release & bulb refills Perfect for watch & electronics repair where canned or compressed air can damage delicate parts Force of air controlled by strength of hand-squeeze Precision solid brass nozzle for exact placement; 2-1/4" diameter x 4" length, weight 2 oz