This handle comes with a length 500mm carbon tube. So, you can cut it to fit you.
The carbon tube of the above image has cut to 200mm.

As you see the image, center grip is made of EVA. This cannot be made of cork due to too thin wall.

Color Group of Reel Seat	Group A	Group B	Group C	unpainted	I.D. of the handle
Japanese Yen	JPY9495	JPY10125	JPY11123	JPY8130	13mm 8.5mm(front grip)

It is easy to enlarge I.D. of front grip with a round file.
-Color Group of reel seat can be found on the linked page of "Colors of Reel Seat". That is shown below of each color name.