Glass Hardness Tile (Educator's 10-Pack)
$15.00
Save 10% with this 10-pack of our glass tiles. Testing mineral hardness is easy and safe with our substantial 1.5" x1 .5" glass tile.
The tile has rounded edges for kids' safety, and at 1/4" thick, it won't
break when being used during testing and will also survive the
occasional drop to the floor.
