Duo of Reflective Multitexture Balls with Sound for Dogs by Zeus DUO. The innate drive to chase and retrieve objects is rooted in dogs' natural hunting instincts. Playing fetch with your dog not only helps channel his extra energy and activate his hunting skills, but it also strengthens the bond between you. The Zeus DUOs are available in three different models: with Squeaker to stimulate auditory interest, with LED for playing in low light conditions, and with Glow-in-the Dark with Squeaker for nighttime fun. Plus, they are offered in two sizes to fit small and large dogs, ensuring every play session is safe and exciting. Key Features: Attracts and entertains Durable TPR construction Available in 2 sizes (small and large)