Vials, Caps, and Vial Inserts. Vials, Caps, and Vial Inserts. Aijiren vials and caps provide simple ways to boost laboratory productivity and return on investment. Aijiren premium certified vials, caps, high recovery vials, and vial inserts offer industry-leading performance; from the lowest bleed septum materials in our caps to the most inert glass vial materials, we are continuously refining our offerings by addressing small details delivering productivity gains.