If your mineral or rocks is attracted to a magnet, you'll know it when using Cornerstone's STRONG 1-inch disk magnet. Two of them stay attracted across your fingers, or on either side of your child's hand. Cool! Great for making magnet crafts, too. $1 each.
Need a bulk pack for your class or homeschooling co-op? Our Educator's 5-pack has a discounted price of $4.50.