What you see is what you get! - Overall length is 38.5mm.
10T Bike Guide Roller Plastic Jockey Wheel Rear Derailleur Pulley 2 Pack - Black
Dolvitrny 2-Pack For Rear Derailleur Pulley Wheels (For Wheels) for 6-Speed and 7-Speed Bikes – 10T Plastic Guide Wheels, Lightweight 15g per Wheel
DAZZLEEX 2 Pcs 10T Plastic Rear Derailleur Guide Wheels for 6-7 Speed Bicycle, Black Replacement Parts to Improve Shifting Efficiency
2 Pcs Bicycle Rear Derailleur Guide Wheels 10T 13T 15T Plastic for Smoother Gear Transitions and Reduced Derailleur Weight Burden (10T)
BBB RollerBoys Jockey/Pulley Wheels Wheels Black 10T BDP-01
BBB Bicycle Jockey Wheels Roller Alu Boys Ceramic 10T/11T Shimano Campagnolo
