Features: 
High-strength aluminum alloy. Anti-rust / corrosion. 
You can freely adjust the size. 
Soft, comfortable, lightweight breathable, also very safe. 
Quality Polyester fiber cloth. Not to hurt the pets skin. 

Specification: 
Color: Blue 
Material: Polyester fiber 
Lead leash length: approx. 3*125cm/1.18*49.21'' 
Size          Chest Circumference         
 S             26-42cm/10.23-16.53''      
M              30-46cm/11.81-18.11''      
 L              34-50cm/13.38-19.68'' 

Tips: please allow 1-3cm error due to manual measurement and there will be different color as different display, please understand. Thanks.