Small A bearing, yes it is. 0.555 pads are for small bearings
One needs 0.555 size Dif Pads for A bearing yoyos, that is what I have in several Freehands. If I want more response I use two 0.03". For unresponsive play one 0.015 Dif Pad does the trick.
I even once put a Core Co pad on a Freehand Zero.There is a hole thread dedicated to A bearings called A Sized Bearing YoYo Love (Small Bearings) - #73 by Exmime