Purple & pink nylon with metal and plastic fittings.
 
Collars average sizes:
Small: 25cm to 36cm long. 1.5cm wide.
Medium: 33cm to 52cm long. 2cm wide
Large: 39cm to 61cm long. 2.5cm wide.
 
Leads average sizes:
Small: 127cm total length. 1.5cm wide. 
Medium: 127cm total length. 2cm wide.
Large: 127cm total length. 2.5cm wide.