-Material (Insulation) - Vinyl.
-Material (Terminal) - Copper.
-Material (Plating) - Tin.
-Maximum Temperature - 75°C.
-Maximum Electrical Rating - 600 V.
-ROHS Compliant - Yes.

Red are to fit wire sizes 0.05 - 1.5 sq.mm/22-18 AWG.
Blue are to fit wire sizes 1.5 - 2.5 sq.mm/14-16 AWG.
Yellow are to fit wire sizes 4.0 - 6.0 sq.mm/12-10 AWG.