Review on Rhode Island Novelty Rainbow Spring by Travis Caminiti

If I were to rate this product alone I would give it a 5. The slinks themselves are made of durable plastic. The coils do not get mixed up and do not bend. Perfect for modeling light and sound waves - something I wanted to do with this in sixth grade science class. But be prepared: if you order more than one, you may not receive the same bottom size. I ordered four and received two full size and two significantly smaller. In fact, smaller versions can literally fit inside larger versions. This annoys me because it means the company intentionally sent me different products with no explanation and no discount. I would return them if I didn't need them immediately for the classroom lab. In short: Great product, but I don't trust the company.