Material: Stainless Steel, it is lead free and nickel free. Stainless steel will not tarnish or change color. It is also a great choice for those with skin sensitivities.Measurements: The big round pendant: Diameter is 20 mm(0.8), little heart pendant : 12 mm(0.47).Manual measuring permissible error.Remember when you would make a wish and then blow on a dandelion? Then, carefully watch as the fluffy little seeds drifted away, carrying your hopes and dreams for that wish to the place where magic happens?Choose the little heart necklaces you need. They could be for a mother and daughters or grandmother and granddaughters. Very sweet and would make a lovely gift!Your necklace will arrive in a beautiful velvet bag. Ready for gift giving. Contact us if you have any questions.