Set of 3 Stress Balls Select and squeeze, to put your strain at ease! These brilliant stress balls, measuring 7cm in diameter, come in three densities; soft, medium, and firm. Soft is for the slightly stressed, medium for the quite stressed, and firm for the very stressed. We are aware that most of us might go straight for the firm stress ball, but they are all simply brilliant, complete with cute illustrations and firm colours. This gift is perfect for anybody that you know who might need to de-stress a bit, whether that is Mum, Dad, or a friend!