diff --git a/src/cli/structure-info/volume.ts b/src/cli/structure-info/volume.ts
index c8ebd5aeee8c658099c0108dada139ab86df0f02..23bf618afea516c5b252966060b0a7082f04d646 100644
--- a/src/cli/structure-info/volume.ts
+++ b/src/cli/structure-info/volume.ts
@@ -38,7 +38,7 @@ function print(volume: Volume) {
 }
 
 async function doMesh(volume: Volume, filename: string) {
-    const mesh = await Task.create('', runtime => createVolumeIsosurfaceMesh({ runtime }, volume, Theme.createEmpty(), { isoValue: Volume.IsoValue.absolute(1.5), pickingGranularity: 'voxels' })).run();
+    const mesh = await Task.create('', runtime => createVolumeIsosurfaceMesh({ runtime }, volume, Theme.createEmpty(), { isoValue: Volume.IsoValue.absolute(1.5) })).run();
     console.log({ vc: mesh.vertexCount, tc: mesh.triangleCount });
 
     // Export the mesh in OBJ format.
diff --git a/src/mol-model/volume/volume.ts b/src/mol-model/volume/volume.ts
index 1bf87a936741013df04c4b65cf823a6490c57170..521ab451d5287d5f81e6040c46414f31c82c4abc 100644
--- a/src/mol-model/volume/volume.ts
+++ b/src/mol-model/volume/volume.ts
@@ -219,4 +219,14 @@ export namespace Volume {
             return Sphere3D.expand(bs, bs, Mat4.getMaxScaleOnAxis(transform) * 10);
         }
     }
+
+    export type PickingGranuality = 'surface' | 'voxel';
+    export const PickingGranuality = {
+        set(volume: Volume, granuality: PickingGranuality) {
+            volume._propertyData['__picking_granuality__'] = granuality;
+        },
+        get(volume: Volume): PickingGranuality {
+            return volume._propertyData['__picking_granuality__'] ?? 'voxel';
+        }
+    };
 }
\ No newline at end of file
diff --git a/src/mol-repr/volume/isosurface.ts b/src/mol-repr/volume/isosurface.ts
index 9ad3da6efe26683bc7500a5678e99b5ab708a3bd..6d3ab3b21ff7ceea8ae3a254ea7ac80c86cc1304 100644
--- a/src/mol-repr/volume/isosurface.ts
+++ b/src/mol-repr/volume/isosurface.ts
@@ -32,8 +32,7 @@ import { BaseGeometry } from '../../mol-geo/geometry/base';
 import { ValueCell } from '../../mol-util/value-cell';
 
 export const VolumeIsosurfaceParams = {
-    isoValue: Volume.IsoValueParam,
-    pickingGranularity: PD.Select<'voxels' | 'surfaces'>('voxels', [['voxels', 'Voxels'], ['surfaces', 'Surfaces']]),
+    isoValue: Volume.IsoValueParam
 };
 export type VolumeIsosurfaceParams = typeof VolumeIsosurfaceParams
 export type VolumeIsosurfaceProps = PD.Values<VolumeIsosurfaceParams>
@@ -67,8 +66,9 @@ function getLoci(volume: Volume, props: VolumeIsosurfaceProps) {
 
 function getIsosurfaceLoci(pickingId: PickingId, volume: Volume, props: VolumeIsosurfaceProps, id: number) {
     const { objectId, groupId } = pickingId;
+
     if (id === objectId) {
-        if (props.pickingGranularity === 'surfaces') {
+        if (Volume.PickingGranuality.get(volume) === 'surface') {
             return Volume.Isosurface.Loci(volume, props.isoValue);
         } else {
             return Volume.Cell.Loci(volume, Interval.ofSingleton(groupId as Volume.CellIndex));