The size for case is 19 x 20 cm ,the length of each dog leash can be extended to 3m, giving you maximum freedom in control. This double headed dog leash can relieve the stress and complications that accompany the walking of your two dogs at the same time. To run with two dogs without having to deal with two separate leashes, also gives your dogs maximum freedom under your control.MATERIAL: The case is built with strong ABS material, double stitched nylon ribbon for the leash, plus a steel hook clip. Inside is a heavy duty coil spring release mechanism for consistent, repeated release and retraction DUAL RETRACTABLE: This double headed retractable dog leash allows you to control two dogs at the same time. This leach for the dog weight less than 15 kg around EASY TO CONTROL: Reliable braking and locking buttons ensure that the length of the belt can be adjusted as needed. quick lock and unlock feature - easy roll-on and roll-off with your thumb NIGHT LIGHTING The LED flashlight provides you with an illuminated, better, and safer nighttime walk ONE BUTTON BRAKE & LOCK: One-touch braking and locking safety system, which allows the dog leash to be adjusted to a comfortable length with ease, walking your dog freely in open area with one hand braking, ensure that you have complete control over your dog's safety