Heavyweight Index Cards are made with extra-thick paper for strong construction. They're perfect for taking your most important notes, public speaking, project planning or anytime you need complete confidence that your cards won't easily get ripped, curled or bent. The thick paper prevents ink from bleeding through so you can use both sides of the card. Ruled front side with a red margin on the top keeps notes and lists neat. Back is unruled for more versatile use.Heavyweight Index Cards are made with extra-thick paper for strong construction. They're perfect for taking your most important notes, public speaking, project planning or anytime you need complete confidence that your cards won't easily get ripped, curled or bent. The thick paper prevents ink from bleeding through so you can use both sides of the card. Ruled front side with a red margin on the top keeps notes and lists neat. Back is unruled for more versatile use.