It can provide 99% high and low RF / EMF radiation attenuation in the range of 10MHz to 30GHz, reaching 85 db. Silver fiber fabric emf protection.
sourcing map Alloy Bike Seat Post Reducer Shim 30.9mm to 31.6mm 60mm Length Aluminum Bicycle Reducing Sleeve Conversion Seat Post Tube Adapter for Mountain Bike Road Bike City Bike
sourcing map Alloy Bike Seat Post Reducer Shim 30.9mm to 33.9mm 60mm Length Aluminum Bicycle Reducing Sleeve Conversion Seat Post Tube Adapter for Mountain Bike Road Bike City Bike
Motoforti 27.2 to 31.8mm Bicycle Bike Seat Post Tube Adapter Reducing Sleeve Long-lasting
HOUSON bicycle seat post shim, 60 mm seat post reducing sleeves tube adapter bicycle adapter for MTB BMX mountain bike road bike e-bike 27.2mm to 31.6mm
HOUSON bicycle seat post shim, 60 mm seat post reducing sleeves tube adapter bicycle adapter for MTB BMX mountain bike road bike e-bike 25.4mm to 27.2mm
Sharplace Lightweight Bike Handlebar Shim 31.8mm to 25.4mm 31mm to 35mm Aluminium Alloy Bicycle Stem Size Reducing Adapter Spacers, Black 31.8-35mm
