Our Birthday Cake Bubble Bombs smell like creamy vanilla cake and sweet buttercream frosting topped with colorful sprinkles. Sweet! When dropped in your tub with running water, this bubble bomb will fizz, releasing it's skin-nourishing oils, sweet cake fragrance, pink color, and bubbles into your bath water. Our bath bombs are unique because not only do they moisturize your skin, but they also create a bubble bath. Most bath bombs do not create bubbles. This bath bomb weighs 5 oz and is about the size of a tennis ball.