The ENW352 comes with 44 sheets which hold 8 cds/dvds (the UPC tag states CD/DVD) per sheet, 4 inserted on each side of the sheet. The UPC tag also states the exterior is 100% Polyurethane, the lining is 100% polypropylene. The insert is about as hard as one expects a binder to be. Interior is all black except for clear disc holders (not "crystal" clear, more matte). The black exterior includes gray stitching and a decorative gray stripe (maybe you can write in it).
There are no tabs to remove before inserting discs (other brands require removing those tabs). You simply unzip the binder and slide discs into holders. They are snug so discs don't fall out simply by turning the binder upside down. If you are careful and realize how the binder straps insert, with some effort you can unlock the straps to remove/replace sheets. There is only access from the bottom of the spine, so the top strap is difficult to remove/insert with bigger hands. They lock from the back (instead of the front like other Case Logic models). I do not have one of the models "designed" for sheet removal, so I am not familiar with how the straps work on those. I would hope they are easier to unlock/reinsert since I don't think they want you to unlock the straps on the ENW352. I have not seen any replacement sheets for this style of binding, though I doubt it could hold more (maybe up to 8 sheets, depending on disc thickness) or that any would need replacing later, unless subjected to abuse.
The binding straps are thin, stiff, but flexible, durable plastic. The inner spine they attach to is thicker. The sheets are a non-woven, "pitted" material with one ply of thin, clear sheeting on either side and slots for the straps to slide through. This 3-ply material should hold up fine under years of repeated use, but I wouldn't let your 3-year-old drag the thing around the house by one of the sheets. The zipper gets "lost" in the bottom when fully opened, so it can take a second or two to fish it out before zipping. This, at worst, is a minor annoyance but doesn't take away from its utility. If you don't force it, it is easily good enough for the binder. I would have preferred the zipper be reversed since the opening left at the top can allow dust into the binder (no such opening at the bottom). The stitching is good enough for its purpose but that means it should be treated well. The material the zipper attaches to is thin like purse or backsack lining but durable and should hold up unless unduly stressed. The handle is fine for the full weight expected. I personally find this to be good enough quality for it's price, and think it will last the 25 years guaranteed under normal handling in the home. For travel I would choose a hard case since this binder won't protect against blunt force, smashing or heavy load (there's no free space or cushion protecting the discs from such abuse), otherwise it is fine on the road if on the seat or even the floor if away from hard, heavy, sharp, sliding objects.
I chose this model because at the time it cost less than other similar binders/wallets/cases with slightly less capacity, and I had no use for the front "+16 insert" the other models had. My main reason for this was so I could see all the writing on the multi-program discs I will be storing. I almost bought a generic 520-disc binder for about the same price, but I'm satisfied with this one since, unlike stated in reviews for the other, it closes even when full, and it does not have tabs needing to be removed on the disc holders. 4 stars since it isn't designed to have removeable sheets. I paid 25 for this binder.
One last thing. There is a loop sewn on the back at the top, I assume for hanging on display in stores.