This heat pack is made from Australian vintage cars themed fabric, blue fleece backing and filled with Australian rice & lavender flowers with 100% pure essential lavender oil. They have been securely stitched for strength, durability and divided into equal sections so the rice and lavender stay evenly divided. The heat packs can be done scent free if required, just message me and let me know. Heat packs have been used in the treatment of muscular aches & pains, headaches, arthritis, stress relief, cramps and much more for thousands of years. They are a natural, chemical and drug free pain reliever and the deep penetrating heat has been known to help reduce recovery periods.Using the microwave, the heat pack is ready for use in approx. 2 minutes and there is no need for water whilst heating. Place your heat pack in a ziplock bag in the freezer and it is perfect to help with migraines, headaches, sprains or just relief on a really hot day!The approximate measurements are cm in length, cm wide and kg in weight. But as they are all handmade slight differences in size and fabric placement may be seen.If you have any questions, please don't hesitate to contact us.