1)economical and popular aluminum stand                   

2)slide-in profile(M-3) is more economical,  clipped profile(M-5) is better for easy installation(additional cost)                                                                             

3)the two feet are all aluminum

4)other sizes are available                                                 

5)if better 3M adhesive for introducing paper, additional  cost                                        

6)the roller inside is plastic, additional cost if better aluminum replaced                       

7)packed in easy single oxford cloth bag, if  better double inner padded bag(additional cost)