Preemie Products
Great product to strengthen the first and second fingers and encourage correct hand position for young writers. My kids love them because they are so different and pretty! Also made from soy wax, so no petroleum products. If the larger set (64 rocks) is too much money, there are also smaller sets with 6 and 18 rocks.
My book, the Preemie Primer, available at Amazon or at your local book store.