Long size: th e length o f cage：9cm-6.5cm / 3.54"-2.55". Short siz e:, the length of cage：7cm-5cm/ 2.75"-1.96". Two kinds of cage to cho ose: Sh ort(7cm) / Long(9.5cm ). Material: Silicone. Soft Silicone, Comfortable to wear and The shape is very popular.
