Powerful bulb duster forcibly blows away dust, lint, and dirt. It provides high-pressure, pinpoint jets of air exactly where desired. Varying the “squeeze” provides for controlled delivery. One-way inlet valve at the top stops air/dust from being drawn through the tip. Non-conductive plastic sleeve-tip prevents scratches and permits cleaning optical lenses, slides, circuit boards, and cuvets. It’s ideal for delicate, difficult-to-clean, and inaccessible equipment. Dust’it™ provides the best environmentally safe solution. Size is 2-1/4 diameter x 5 inches. Weight is 2 ounces.