Vials 2 Ml Caps found in: 2 mL Graduated PFA Micro Vials without Caps, E-C Vials w / Rubber Lined Caps, Amber, 2 ml, E-C Sample Vials w / out Caps, Clear,.. Seven different cap colors, blue, pink, green, yellow, red, white and natural are standard on the 2.0 mL sizes. sizes.