says
Fair Play First
♻ ITTF Circular notification to all manufacturers said:2.7 PACKAGING
INDICATION OF RUBBER PROPERTIES.
A hardness value shall be indicated either by Shore А or by Shore O scale or both. The type of hardness scale must be еncoded with letters HA and HO respectively.
Hardness scale of a different type shall not be used.
EXAMPLE.
HA 42.0°
HO 52.0°
HA 38.5°
HO 48.5°
(refer to the image enclosed)
Type of hardness scale currently in use by China manufactories, as proved by a German engineering laboratory.
⭕ Palio =HO
⭕Double Fish =HO
⭕ DHS = HA
⭕729 = HA
Good to see ITTF takes efforts to enforce uniformity of technical data for all manufacturers. It is due and overdue measure by ITTF, for the better benefit of all customers.