27.2mm, 105mm drop, external routing.
eBay
New X-fusion Manic MTB Dropper Seatpost 31.6MM 361MM 125mm Internel Cable Dropper Seat Post For Mountain Bike Gravel Parts
Aliexpress UK
Why choose the Flander's?. You'll be dropping so smoothly, even the trees will applaud. Imagine this: you're ripping down a technical descent, eyes glued to the trail, adrenaline pumping. But wait. your saddle's in the way!
eBay
SDG Tellis V1 Dropper Post Bike Dropper Seat Post 34.9x170/200mm Internal Routing Cable Remote Wire Control Lift Seat Tube Mtb S
Aliexpress UK
Near new condition.
eBay
X-fusion Manic MTB Dropper Seatpost 31.6MM 361MM 125mm Internel Cable Dropper Seatpost For Mountain Bike Gravel Seatpost
Aliexpress UK
Under seat lever to raise and lower, so all the benefits of a dropper but without the cable faff and allows easy removal or swapping between bikes. - 45 mm saddle clamp length (saddle clamp centre to dropper stanchion).
eBay
ZOOM Mtb /Gravel Dropper Seatpost Height Adjustable Internal Routing 80mm Travel Bike Dropper Seat Post 27.2MM
Aliexpress UK
Used but good working order. 3 drop positions. 100mm drop version. 380mm long top to bottom.
eBay
KORE MEROCA Bicycle Dropper Seatpost 30.9/31.6x425mm Internal Routing Cable Remote Wire Control Lift Seat Tube MTB Seatpost
Aliexpress UK
Xfusion Manic dropper post, like new, removed from a new bike. Teeny wee mark on lower section from removal but essentially as-new condition. Stanchion / upper post unmarked 😁. - 125mm drop - 30.9mm diameter. - no lever or cable Will be sent in a dropper post box from another brand.
eBay
TESNO MTB Road Bicycle Shock Absorber Seatpost Tube Bikes Seat Post Dropper Manual Travel Height Adjustable Suspension 30.9/31.6
Aliexpress UK
2-The seat tube relies on air pressure to rebound. When the switch is lifted, due to the slow speed and slow release of air pressure, the-seat tube rebounds very slowly or cannot rise. When the rider sits on the-seat, the seat tube is under great for force, and the air pressure is compressed sharply and released quickly, so the-seat tube can bounce up quickly to absorb shock.
eBay
Elevos MTB Dropper Seatpost 31.6mm 125mm/150mm Down Pull Internal Cable Remote Control Adjustable Suspensin Seatpost
Aliexpress UK
Get ready to ride harder and smarter – upgrade to Elevos. Internal cable routing for a clean look and better protection.
eBay
ZOOM MTB Bicycle Shock Absorber Seatpost Bike Seat Post Dropper Manual Travel Height Suspension 27.2/30.9/31.6mm Bike Seat Tube
Aliexpress UK