Male sperm whales average 15m in length. The maximum size is approximately 18m. Female sperm whales reach lengths up to 12m, but are usually smaller. A calf at birth is about 3.5 to 4.5 m. Sperm whales are the largest of the toothed whale species.  Hence the Sperm whale shaped stress ball is one of our largest stress balls at 16.5cm in length.  This is a great hand out or give away item especially at marine or sea related exhibitions.  Find out how we can tailor make this stress ball to suit your company by filling out the submit form below.