Information from Ultra Pro:

Ultra PRO's original clear Soft Trading Card Sleeves are made with non-PVC, archival safe and acid-fee polypropylene film. These sleeves protect your valuable trading cards and collectible game cards from dust, dirt and natural oils from hands during handling and storage of the cards. Designed to hold standard size (2-1/2" X 3-1/2") trading cards up to 35 points in thickness, these sleeves also minimize surface scratches on your cards during sorting, display or, for gaming cards, during game play.

Each pack comes with 100 individual sleeves.

The original "Penny Sleeves", Ultra PRO's clear Soft Trading Card Sleeves protect your valuable trading cards and gaming cards during sorting and gameplay
Designed to hold 2-1/2" x 3-1/2" (63.5mm x 88.9mm) standard size cards up to 35 points in thickness
Made with clear non-PVC, acid-free and archival-safe polypropylene film
Recommended for use with Ultra PRO's toploaders (items 81222 and 81145) for the best inner and outer layer protection
Comes with 100 individual sleeves per pack