The new Micro X Seatpost from SDG Components. SDG is Distributed in the UK by https://www.silverfish-uk.com/

Micro Aluminum Seatpost
FEATURES:
The I-Beam Micro System has the widest range of fore and aft adjustment. The I-Beam System uses a single, easy-access 5mm bolt for quick and simple adjustments or saddle changes. New micro head design allows precise angle adjustment. 6061 cold forged aluminum head and clamps with 2014 aluminum tube.
WEIGHT: 220g (27.2mm x 400mm)
DIMENSIONS: 27.2mm, 30.0mm, 30.9mm, 31.6mm x 400mm
SUGGESTED RETAIL: $79.99 USD