White Tyvek Standard 3.5" x 2.25" Credit Card Sleeve Protector Envelope, Box of 100 Abrasion, moisture, & static resistant: protects card & magnetic strip against scratches, liquid, magnetic degradation Super thin, smooth, light weight & postage-saving and yet rip, tear, and puncture-proof Open-ended and double thumb-cut for easy access to card Can be written on by ball pen or pencil: to jot down that always forgettable balance amount or expiry date right on the sleeve Protected in heavy duty and easily-accessible white box