Looks likea Phyllostachys, possibly Golden Bamboo (Phyllostachys aureocaulis)
Golden bamboo (Phyllostachys aurea) has very different leaves to Sasa.
I have several of both plants in my garden. The two leaves at the left are Golden bamboo, the one on the right is Sasa...
Typically, the leaves of Golden bamboo are 20-25mm in width. Sasa is much bigger, typically 80mm in width.
But your bamboo might be something else.
Your right - re looking at the plant, the leaves are very large! Much larger than Golden Bamboo.