These 3.5" diameter, nonslip cork coasters are a perfect solution for underneath Sky Feather Farm's round Lotion Bars and Massage Bars. They will protect the lotion itself and the surface each bar sits on from the oils released. Cork is a natural, soft material that is absorbant to water and oils (oils may deepen the color of the cork). They have that rich cork smell, but subtle. Highly recommend to include these coasters with your lotion bar and/or massage bar order!