A syringe filter title in this shop is trying to answer four questions before you open the pack.
What width is the disc? The titles use 13 mm, 25 mm, and on some packs 33 mm.
What membrane is in it? The names that appear are Nylon, PES, PTFE, MCE, PVDF, and, on one listing, BT.
What pore size is printed? The numbers that appear are 0.22, 0.45, 0.8, 1.2, and 2.0 µm. A smaller number is a finer pore. The title only tells you which number that listing offers.
How many pieces are in the sale? The packs currently sort into 5, 10, 25, 50, and 100.
Those four lines are also what the shop filters use. On the shop page you can narrow by membrane, diameter, pore size, and pack size. Two choices in the same group mean either one. A choice in one group and a choice in another mean both.
This note is not a method, and it is not a statement that a filter has been checked against your sample. If the title still does not answer the job — what you are filtering, and how many you need — write before you order.