Our car diffusers are charming glass squares designed to contain fragrant essences diffused through the wooden lid, permeating pleasant aromas throughout the vehicle for 3-4 weeks. The diffuser base is crafted from a non-toxic composition primarily comprised of glycerin, a renewable resource derived from soy-based biodiesel by-products. Composed of 70% renewable materials, these diffusers boast a lower carbon footprint compared to glycol ethers like DPC, DPM, and DPMA.