The product is Gator, 5 Pack, 4.5" x 4.5", 150 Grit, Aluminum Oxide, Sanding Sheets, Stick On Premium Sheets Designed To Fit Any 1/4 Sheet Stick On Palm Sander, Heavy Duty Resin Sandpaper Resists Heat & Humidity For Longer Life, Pressure Sensitive Holding System Holds Securely Without Slipping, Tearing, Or Wrinkling Allowing 100 Percent Use Of The Sanders Motion, For Use On Wood, Metal, Drywall, Fiberglass & Painted Surfaces, Resin Bonded To Resist Heat & Humidity For Longer Life.. Easy to use. The product is manufactured in China.