Easy to marking area: Plastic centrifuge tubes include a convenient white writing patch for easy marking and identification. This little mark tube feature is very convenient for labelings purposes. Material: The self-standing centrifuge tubes are made of quality PP (polypropylene). Application: Apply to loading solid, liquid, powder, seeds, pills, granular objects etc. Colour:As Shown Material:Plastic Package Contents: 50 * 50ML Self-Standing Centrifuge Tubes Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Dadangjia