The 22742 test tube measures 13x75 mm and features a clot activator combined with a gel separator and ships with a label and red cap. The 22732 test tube measures 13x75 mm and features clot activator and gel separator and comes with a label and red cap. The 22722 test tube is 16x100 mm in length and comes with a clot activator, gel separator, red cap and label. The 22842 test tube comes is 13x75 mm in length and ships with a clot activator, gel separator, label and brown cap. The 22832 test tube measures 12x86 in length and features a clot activator, gel separator and comes with a label and brown cap. The 22822 test tube is 16x100 mm in length and features a clot activator and gel separator and comes with a label and brown cap.