Glass handeling cups for sale

I recently purchased 6 of these and rebuilt 4. I used one to help install a 51 Hudson rear glass. Worked very well and was glad I had them as I did the job by myself. You pump the air piston and it creates a suction. They have red bands that will allow you to see they are still "in suction". 
Anyway, I am going to sell two and keep the other two to use in the future. These are a professional brand. New inner parts and rubbers look new. 40.00 each plus shipping if anyone is interested.