Amazon.com : REDSHIFT ShockStop Suspension Seatpost for Bicycles, Shock-Absorber Bike Seat Post for Road, Gravel, Hybrid, and E-Bikes, 27.2mm x 280mm : Sports & Outdoors
REDSHIFT Assembly & Review: The Shockstop Suspension Seatpost - YouTube
Redshift ShockStop Suspension Seatpost - 27.2 x 350mm, 35mm Maximum Tr - Pro Bike Supply