S: 50cm/19.68'' Inner Diameter:30cm/11.81'' Fit for Pets Within 9lb = 4KG
M: 60cm/23.62'' Inner Diameter:40cm/15.75'' Fit for Pets Within 17lb=8KG
Notes: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 2. Please allow 1-3cm measuring deviation due to manual measurement.