Essential detail.
A must for professional.
To find the most effective riding position.
Made in a high modulus carbon fiber.
3 K woven external layer.

for headset 1" 1/8 (fork steerer outside diameter 28,6 mm)
outside diameter 32 mm; inside diameter 28,6 mm; thick 10 mm
outside diameter 32 mm; inside diameter 28,6 mm; thick 15 mm
outside diameter 32 mm; inside diameter 28,6 mm; thick 20 mm

for headset 1" (fork steerer outside diameter 25,4 mm)
outside diameter 30 mm; inside diameter 25,4 mm; thick 5 mm
outside diameter 30 mm; inside diameter 25,4 mm; thick 10 mm