30mm diameter bumpers . Medium/firm 65shore bumpers currently only available. Soft on backorder.
Height of whole setup is 5mm plate + 10mm bumpers.
They also have 6mm thick plates but these are very stiff.
They said they will also be able to make custom plates for wider boards or narrower boards, or a carbon mount for go pro etc.
Design looks more thought out then geckos with the mounting. Will write full review once I try them out.