These cuties are made from Onyx from Mexico. The board has a piece off the bottom have marked down
Weighs 200g and is 9.5cm x 5.1cm
It is said that Onyx is a great stone for protection, and is balancing and grounding like obsidian or tourmalines. Onyx is a stone of self-mastery and inner strength. It promotes discipline, memory retention, and attention to details; making it a useful stone for students or teachers.