Good for them and can be a toy for fun. Made of calcium stone and cuttlefish bone,it is safe and no toxin. If you have any problems about our product.Please feel free to contact us directly any time and we'll reply to you within 24 hours. Bell can make sounds when they are playing. Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding. If you have any other questions, please contact us.