Justace TRG Cork Composite Rear Grip for Casting Reel Seats
This is a rubber col clear grip for bullet-type separates. If you use a carbon pipe that matches the inner diameter of the grip, you can work more easily without machining the inner diameter. The 25 mm version can be used as a rear grip for the reel seat "TCP-FBCSK13".
The 27mm version matches up with most standard casting seats including the TCP-FBCSK15.