A shower tray or other article having a face with an anti-slip surface comprising an array of spaced apart raised projections. Each projection has a height of between 0.5 mm and 1 mm and a top surface with an area of between 3.14 mm2 and 50.27 mm2, adjacent projections being spaced apart by between 10 mm and 16 mm. Each projection is shaped to have a right angled edge between its top and side. The projections are flared at the bottom. The anti-slip surface exhibits high anti-slip properties while being comfortable and easy to clean.
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