This is a pretty small soft, solid, clear line . It's the perfect thing for those small fuel lines at the engine.  It can bend at a sharp angle without kinking.

See Size A1 Ferrules for this soft line. 

This soft line equals the following equivalent 1:1 size at each scale.
1/25 scale = 5/32"
1/16 scale = 3/16" 
1/12 scale =3/16"
1/8 scale  = 1/16"

Depending on your scale, this could be used for a 1/16 radiator overflow tube or 1/25 small carburetor fuel lines, or other clear line needed.  
This soft rubber line is easy to bend and shape to your installation. 

Each package contains one coil of .012" x 1' clear flexible line.