It’s high quality bungee with stainless steel hook and silica rubber rope.
Model A Diameter of stainless steel is1.8mm
Hook length is 48.5mm
Diameter of rope 5mm
Product length is 106mm
Model B Diameter of stainless steel is1.8mm
Hook length is 39.7mm
Diameter of rope 4.5mm
Product length is 175mm
Model C Diameter of stainless steel is4mm
Hook length is 69mm
Diameter of rope 6.5mm
Product length is 263mm