... 3 50s/2/3 60s/2 1. Counts:20/2,20/3,20/4,20/6,20/9,30/2,30/3,40/2,40/3 ... ,50/2,50/3,60/ ... 2 and 60/3 etc.;2. Resistance to ... chemical ,abrasion resistant & excellent resistant to color change;3 ... 4. Low shrinkage 5. silicon oil available: upon 3% 6. Color available more than 500 7. ...