Here is a glossy black hard line that holds its shape and doesn't kink at tight angles.

This is has a solid copper core that makes it pretty stiff.

This hard line equals the following equivalent 1:1 size at each scale.

1/25 scale = 2 1/2" 
1/16 scale = 1 1/2"
1/12 scale = 1 1/16"
1/8 scale  =  3/4"

Depending on your scale, typical uses range from radiator hoses and puke lines to heater hoses. 

Each package contains one coil of .098" x 12" black hard line.