What paving is this?

[notreadyforthis]

My builders are having a tough time finding a similar paving slab to replace ones that have been broken in my garden as part of our building works. Can anyone help with identifying what type and colour of slab paving I should be looking for?

 

The picture doesn't really show it that well but after a good pressure wash they come out a light pink colour and will last throughout a summer then go grey over the winter as they get weathered. They measure 60 x 60 for the larger slabs.