Colorful Plastic Whistles Set Vector Image. Contains 15 different color simple whistles. The well-designed vector illustration would be a great addition to your own web-design project. The item is available in the vector (.eps) format. We’ve collected lots of high-quality artworks made by professional designers which can be useful to create a stunned e-learning course or any educational project. Feel free to browse through our vector graphics library and pick any image(s) you need.