This tube has two uses: holding and isolating the queen and marking the queen. Queens do not like to enter the tube and must be coaxed in. The soft plunger will keep her prisoner until you are ready. The marker will hold the queen in any direction or angle that is convenient. Gentler and safer on queens.
I used this for several seasons and had no problems. I was always afraid I would tear the fabric mesh out, but it stayed together. I misplaced it, and bought one with plastic mesh from another supplier. The holes in the plastic mesh were almost too small for the posca paint pen. The queen got only a tiny dot. I like the fabric mesh better than the plastic.