This a soft rubber tubing (hollow) that is easily configured to the space you have. It's able to bend at a fairly sharp angle without collapsing.  The hollow ends make it easy to attach to objects with a placement of a pin or stud they may already exist.
For fittings, see Fittings sized at .100 for this soft line.

This soft line equals the following equivalent 1:1 size at each scale.
1/25 scale = 2 1/2"   Excellent size for Roll Bar Padding due to the thin wall - slice it down the middle with an x-acto knife and put it over your chassis tubing
1/16 scale = 1 1/2"
1/12 scale = 1 1/16"
1/8 scale  =  3/4"

Depending on your scale, typical uses are larger coolant (radiator) hoses and fuel lines, as well as other larger fuel lines. Can be used for 'puke' lines on a 1/12 Funny Car or TF rail.  The current trend in TF is the use of black lines for fuel, from the pump to the barrel valve and for the injector lines at the 'hat' and the manifold. Can also be used for small roll bar padding.

This soft rubber line is easy to bend and shape to your installation. 

Each package contains one coil of .098" x 12" rubber tubing