cheap in every way

Yes, I wanted a low-cost aluminum frame and had therefore set me on something sharp edges and not as high quality details like the fixing mechanism on the back. What I had not counted on was the quality of the so-called underground Plexiglas. After I found blisters in the surface of the disc, I believed that there would be an additional protective film on the disk. But I could find no clues. Jeodch the material of the wheel is so soft that you can write on the disc without any particular pressure with your fingernail. => Any recommendations for this product.