What size grit/gravel for Bonsai Trays?

[George the Pigman]

My wife has a collection of outdoor bonsai plants and a resourceful friend has built a Japanese style bench to put them on with a rubber covering. I want to put gravel/grit in the bench partly for decoration and partly to increase the water retention/humidity. What size or type of gravel would anyone recommend?

[George the Pigman]

[Tee Gee]

I did a google and found this:

https://www.amazon.com/Bonsai-Jack/b/ref=w_bl_hsx_s_lg_web_8126182011?ie=UTF8&node=8126182011&field-lbr_brands_browse-bin=Bonsai+Jack

Ok it is an American source but perhaps after reading it you will find  British equivalent

[George the Pigman]

Thanks Tee Gee but they all seem to be grit that's added to soil to improve drainage for potting up rather than grit just to put the pots on.
We had a long look at a local garden centre that does an excellent range of grit and gravel and even lets you take samples home. In the end we opted for the 10mm-20mm pea gravel our friend bought for us in the first place from the builders yard. But will will probably put a thin layer of more "ornamental" stuff over the top of it.

[woodypecks]

I would love to see a picture of your bonsai collection !