Although we have not measured the doTERRA brand bottles to confirm, our Essential Oil Labels page suggests the OL32, 0.5" round labels, for bottle caps. You can review the Essential Oil Labels page at the link below. https://www.onlinelabels.com/essential-oil-labels.htm We also offer samples for testing. You can visit the following link for free samples of this standard item: https://www.onlinelabels.com/samples.