In other words

They deliver powerful and consistent braking performance in all riding conditions by using 'Shimano's Ice-Technologies Freeza' feature that greatly improves heat dissipation and ensure consistent high performance braking even on the steepest downhill stretches

Note that while the material itself is waterproof and will shed off rain

COMPATIBILITY: Fully compatible with 1x drivetrains

Thick rounded ends to protect against grip blowout

Hope Pro 4 Front 6 Bolt Disc Hub - 15x100mm - 32 Hole - Red Gift Voucher In other wordsThe Pro 4 is an incredibly versatile and easily serviceable hub that builds upon Hope's reputation for bulletproof quality and attention to detail. The hubs are machined from a single billet of 2014 T6 aluminium and run on stainless steel sealed cartridge bearings for smooth running and outstanding reliability. Specs: 15mm axle. Sealed stainless steel cartridge bearings. Hub shell machined from forged aluminium billet. Standard 6 bolt disc fitting.