A staircase nosing is a thin piece of plastic that is secured to the edges of every landing edge on a staircase. Stair noses can be built of a variety of materials, such as metal, wood, and rubber, and can take on a variety of shapes and dimensions. Stair tread nosing might be trendy and contemporary or designed to complement traditional staircases. https://floorsafetystore.co.uk/Cataloge/stair-nosing/