Material:Polyester Size: A: inner diameter 2.36 outer diameter 4.72 B: inner diameter 2.36 outer diameter 4.72 C: inner diameter 2.76 outer diameter 4.72 D: length 2.56 width 1.97 strap length 6.69-7.87 Features: 1: The best choice for summer travel comfortable and breathable polyester fabric soft and delicate to the touch. 2: High-quality fabric adjustable neck circumference will not have a tight feeling can be used with the attached traction rope to give pets a more comfortable experience. 3: S is suitable for most guinea pigs and young rabbits of 0.5KG M is suitable for most young rabbits and adult rabbits of 1-2KG and L is suitable for most adult rabbits of 2.5KG. Package Include: 1 x decorations Notes: 1. Please allow 1-3 cm difference due to manual measurement and 3-5 g for the difference between different colors. 2. Due to the screen difference the color may be a little different from what you expect please allow it. 3. 1.00cm=0.39