SCP-531 consists of several paired sets of brass statues depicting stylized felines. The cats are in a seated posture, looking forward with ears raised in what is usually described as an 'attentive' expression. Each cat is 74.2 cm tall and is solid metal weighing 451.7 kilograms. Their eyes are inset with what appear to be polished tiger-eye stones that give an impression of luminescence, though they do not directly emit visible light.