The unique “egg” shape of these balls offers a larger contact base with the floor, providing increased stability during use. Their oblong form allows two people to sit on the Eggball at once. They represent the ideal aid for who want to perform gymnastic exercises with the ball in safely and with the highest degree of stability. They are available in 4 bright colors and 4 different sizes with diameters of 45 cm. up to 85 cm. and lengths up to about 125 cm. Each ball supplied in box is provided with a complete exercises guidebook in 6 languages.