3" Tape Black Carbon Fiber with fiberglass Cloth plus Blue Lines. Style CGH175BT Ideal for Carbon Parabolic Rails and for strengthening the tail area for back foot pressures. Custom made for surfboard production and suitable for all surfboards, Retro�s and Long boards.Carbon/Kevlar tapes are used on surfboards rails, to create a unique flex pattern used by various surfboard manufactures. The carbon or Kevlar creates superior strength that acts as a frame which maximizes speed drive whilst creating a flex memory that flows with the wave.