This Red Blister paving is uses for uncontrolled pedestrian crossings for the bling. 
400mm x 400mm x 50mm deep.
These Yellow Buff Blister Paving are used for controlled pedestrian crossings for the blind. 
400mm x 400mm x 50mm deep.
These Yellow Buff Blister Paving are used for warning pedestrians of steps ahead for the blind. 
400mm x 400mm x 50mm deep.