I like the hardness numbers on the samples with a corresponding table what the sample is. There was relatively little corundum, but it's the hardest, so not much of it is needed. I'd recommend putting a durometer number on it to keep a few sticky dot markers from getting tangled. A great gift for a climber interested in specimen identification. I have used it several times to determine the hardness of samples.
π§ͺ Acrylic Learning Kit: Remarkable Periodic Elements
3 Review
Showcasing the Beauty of the Periodic Elements: Acrylic Sample Display
3 Review
π Argentina Meteorite Introduction Certificate with Genuine Authenticity
3 Review
π Exploring the Fascinating World of Amazingbug Lifecycles: Classroom Specimens for Hands-on Education
3 Review
Anatomical Chart of Spinal Nerves and Dermatomes
3 Review
KISSTAKER Removable Heart Visceral Educational Parts
3 Review
π©Ί Anatomical Laminated Respiratory Circulatory Pack: Enhancing Understanding and Visualization for Medical Professionals
3 Review
π Laminated Anatomical Pack for Skeleton Ligaments
3 Review