Is this a PVC free sleeve??

i got this cute mini binder as a present from a friend but i have no clue if the sleeves in it are pvc free and it didnt say on the website they got it from. the sleeve arnt transparent like most but its still see-thro... also side note why do ppl need pvc free sleeves anyway?? the only reason i always buy pvc free cuz when i first started collecting ppl told me pvc free sleeves only but one ever told me why. thx in advance btw!!

https://preview.redd.it/7clyga7fb0de1.png?width=1068&format=png&auto=webp&s=650cccce229fa9651f7504be22437639240a1af0

https://preview.redd.it/df8o21pgb0de1.png?width=752&format=png&auto=webp&s=82c58e20f71663643e043d0116806f5826baf5f2

https://preview.redd.it/4clp64tib0de1.png?width=848&format=png&auto=webp&s=c2d875495f866e92d2d637b6caf05ea893176c94

with binnie in it as reference (if it helps??)