One of several items I purchased. Impressed by all, but these were my favorite. I didn't even know what "Welting Material" was when purchased, lol: only knew I didn't want to use expensive material for liners and prototypes. Really like the size; very accommodating. Was highly temped to purchase more after I checked out the 3 I bought; but I haven't even started working up these. Will seek these out in the future!