Thread tomatoes, basil leaves, and mozzarella cheese cubes alternately onto 10 (6-inch) wooden skewers. Place skewers on a serving platter.
Combine vinegar and oil in a small bowl; stir well with a whisk. Drizzle vinegar mixture evenly over skewers, and sprinkle with salt and pepper. Serve immediately, or cover and chill until ready to serve.