Replaced ours last year, I'll confirm the answer they are hose.
When replacing them I considered using black rubber hose for UV resistance, but was worried about it leaving black marks on the mast paint. I ended up using regular clear reenforced vinyl water hose figuring it was easy to replace if needed.
Just had them in hand the other day. A year later of mostly tropical sun, and they are still in perfect shape.
Annapolis, MD, USA.