The BILMAG 9-ball rhombus is suitable for 57.2 mm pool balls. It is black and is made of PVC. This rhombus is used to neatly position the billiard balls at the beginning of a game. It is a simple and basic accessory for 9-ball pool billiards. Please be reminded that due to lighting effects, monitors brightness/contrast settings etc, there may be some slight differences in the colour tone of the pictures.