Ruled Index Cards, 100lb Heavyweight Thick White Cover Stock, 100 per Pack

The Ultimate Guide to Index Card Sizes

Cardstock Warehouse, Invitation & Scrapbook Paper

Ruled Index Cards, On 100lb Heavyweight Thick White Cover Stock. 100 per pack (5 x 8) - Yahoo Shopping

Oxford Heavy Weight Ruled Index Cards, White, 3 x 5 - 100 count

Oxford, Oxf30bd, Plain Index Cards, 500 / Bundle, White

Natural White Flat Card - A7 LCI Linen 5 1/8 x 7 100C - LCI Paper

If you're looking for that classic thick, reliable and sturdy index card, this is the perfect one for you!, Made from 14pt. 100lb extra thick

100 Extra Thick Index Cards | Blank Note Card | 14pt (0.014”) 100lb | Heavyweight Thick White Cover Stock | 100 Cards Per Pack | 5 x 7 Inches

PG Creations 150 Pieces Large Size Index Cards with2 Screw Posts, Unruled Plain, 4.5x4.5 Inch, White - (200 GSM, Thick Flash Cards)

Quick Guide to Cardstock Sizes and Paper Weights

Understanding Paper Weights & Sizes - Artech Printing, Inc.