Brilliatech from 2006 to 2010
first of all,  we do clay bar for customer accroding to customer request.  
we got different clay bar in different color, blue clay bar, green clay bar,yellow clay bar.......
also, got magic clay bar in differnet hardness, different hand feeling.  
some customer know our item number is BT-2009 
The 2009 of item number means the clay bar developed in 2009.
this picture is not complete of grade for the clay bars. this picture is 2018 year.

Our current (2023)clay system include  3 series of grades; 

popular grades of clay bar in Fine, Medium, Heavy. 

but also develop King  series clay bars, K1,K2,K3, 

and Piont Grade, P1,P2,P3. 

about 9 grades of clay bars.