CeramicSpeed OSPW Pulley Wheel System Shimano 9000/6800 Series - Alloy Pulley Carbon Cage BLK MFPN=11100289 Most droppers work great with

Most droppers work great with both and it comes down to personal  preference on the firmness of the lever feel and extension of the lever over the grip

Black with gray graphics

Windproof backhand with breathable 3-layer Interlock polyester

the fresh optical design enhances light dispersion

CeramicSpeed OSPW Pulley Wheel System Shimano 9000/6800 Series - Alloy Pulley Carbon Cage BLK MFPN=11100289 Most droppers work great withThe CeramicSpeed Oversized Pulley Wheel System provides optimization and increased efficiency of the rear derailleur through its extremely low friction bearings and unique overall design. Features two oversized 17 tooth aluminum pulley wheels with Grade 3 Silicon Nitride balls Robust cage crafted from polyamide and carbon fiber for durability and light weight Defined Color Black Drivetrain Speeds 10 Fits Brand Shimano Fits Model Dura Ace 7900 7970