20mm diameter; 3.5mm thick; 2mm hole (hole is through the diameter, aka: across the entire bead). Note: they are slightly bowed out in the centers (they don't stack up well) but they are nicely finished/sanded so would make good bracelets.
Set of 3.
Design Team Member Nichola Battilana made a Wee Sewist's Shrine (see the wide photo below). More info in the blog and/or see the supply list.