They are produced by Fuji, Japan and Philips, Belgium
Philips code:

4322 022 51301 for core set RM8
and              4322 020 28231 for core halves RM8
and              4322 020 21012 for core halves P11/7

Fuji code:

H21B RM8-830 with Gap&H24Z RM8G-12000

Clips of the same make are also available.

Minimum order quantity: 500 units(one box).

Could send a free sample if buyer pays its shipping cost.