The selling item is a factory sealed bag with 4 or 5  masks inside, depending on your choices.(two inner layers are using antibacterial materials, outerlayer is not)
we have same quality caro masks with elastic adjustable ear straps from this listing:  eBay item number:392990278180
Please kindly read the below description:
Each mask consists of 3 layers.
Inside: 100 % Cotton  (Antibacterial)
Middle layer: 100% polypropylene ( Anti-bacterial material) ( thin layer- filtration Wikipedia-"polypropylene- face masks")
Outside: 65%Polyester / 35%Cotton - not anti-bacterial material
There are multiple caro fabric colors
For set of 4 masks in a seal bag- elastic ear straps
Available colors:
Mixed #1:  4 masks: mixed 4 colors: all 4 caros of these elastic ear straps masks
Mixed # 2, 4 masks:  mixed 2 caros: 2 masks each color of elastic ear straps masks
For set of 5 masks in a seal bag- elastic and adjustable ear straps
Color 1-14
Mixed #3 (colors 1-5)
Mixed # 4: (color 6,7,8,2,10)
Mixed# 5: ( color 11-15)
ONE SIZE,
elastic ear stras can be stretched about 1"
Washable and Reusable
For safety purpose, we do not accept for returning. Note: different outer layer (100% polyester), 2 and 3 layers available at  eBay#392835792577 Made in Vietnam
Disclaimer:Product is not intended for medical purpose! For safety purpose, we do not accept returns. Seller describes the products as being informed and with proofs provided by manufacturer.
Thank you very much and please stay safe!