Tempered glass. Stanchions are by 'Real Railings'. Seems to be staying clean but it's only been in place 4 months.

Lovely! Admiring the diagonal planking that draws the eye to the water. Please tell us where you sourced the glass - our local hardware store suppliers won't do quadrilateral glass sides for stairs, quoting "safety issues". We want them for our house. Thank you.

Does this result in a lot of birds breaking their necks? - love the look, considering glass balustrades for similar cottage application

Interesting outtake of bird collisions. I too live on a high peak area with many birds and crows. I shall take this into consideration.

I apply Window Alert decals to my glass windows and they work so the birds know they can't fly through.

Try Ornilux glass. The glass is engraved with patterns birds see but people don't. Works well.