These Card Concept soft card sleeves, also known as penny sleeves, are archival-grade, acid-free and non-PVC clear polypropylene to ensure your cards are protected over time. They're very similar to Ultra PRO Penny Sleeves in terms of materials and quality. They're designed to hold standard 67mm x 92mm (2-1/2" X 3-1/2") cards for example, Pokemon or Magic: The Gathering (MTG).
These can be used for Yugioh and other smaller, Japanese cards too, but they may be loose and have more room to move. There are 100 sleeves in each pack. You place your trading cards inside the sleeves, and this protects them from normal day to day wear, such as scratches and finger-marks. UV technology also helps prevent the cards from fading. If you use your cards a lot, then these are a very cost efficient and great way to protect your collection.
 
Card Concept - Standard Soft Card Penny Sleeves features:
Holds standard size cards up to 67mm x 92mm (2-5/8" x 3-5/8").
Protects your collectables from damage, including scratches.
Clear polypropylene.
No PVC / Acid Free.
Ultra clear.
Perfect for use inside toploaders.