Material: They are stainless spokes

8mm part of the bar (beside the stem)

but only with adaptors (sold separately)

The hose when not in use

the wide range of adjustment on the clamp makes it capable of clamping onto a range of top tubes

PRO Team Gravel Seatpost Bag - Black - 10L PDP|Colour Material: They are stainless spokesDesigned to provide you with a better sports bicycle experience the PRO Discover Team Seatpost Bag provides bikepackers with a large storage solution which straps neatly to the seat post and saddle of your bike. It features a 10 litre capacity, welded seam construction and is both light weight, at just 201 grams, and fully waterproof. The Discover Team Seatpost Bag also boasts an anti sway design, to ensure it stays in place even on the roughest