Product specifications: Name: three-color luminous ball Small smooth ball Size: 5.5 cm in diameter (2.16 inches) Spiny ball size: 5.5cm in diameter (2.16 inch) Large smooth ball: 7.0cm in diameter (2.76 inch) Small smooth ball Weight : 46g/piece Spiky ball weight: 41g/piece Large smooth ball weight: 92g/piece Quantity: 2pieces and 4pieces Style: Ball Ball Solid / Prickly Ball Product Features The luminous three-color ball is made of TPR material, which is safe and healthy; Rolin Roly luminous ball is very durable and soft material, which can protect dog's teeth and is suitable for bite-resistant toys; The luminous ball has very strong elasticity, which is an ideal toy for training dogs' agility; The collision can emit light, and the solid ball will emit colorful light, which is very beautiful; Small smooth ball Size: 5.5 cm in diameter (2.16 inch) Thorny ball size: 5.5 cm in diameter (2.16 inch) < /p> Large smooth ball: 7.0cm in diameter (2.76 inch) Small smooth ball Weight: 46g/piece