ShockStop PRO Suspension Seatpost V2 – Redshift Sports
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
Review: Redshift ShockStop may just change your mind about suspension seatposts - Bikerumor
Redshift Shockstop Suspension Seatpost 27.2 x 350mm | eBay