Our fur babies need some relaxation too! The Black Volcanic Diffuser Charm is the perfect way for your pup to find their inner Zen. Naturally made from black volcanic rock, the charm on the lava stone gives a little fashion flair to our fur babies while diffusing their calming oils. Although they are considered to be of stone, they are very lightweight! Square: 13x13mm Round: 14mm The split ring is 10mm and a total length of approximately 1 1/2" inches. Apply calming oil to the lava stones and place the charm on your pup's favorite collar. Perfect with our Fabulously Calm Essential Oil!