Jolly Holly Letterhead & Envelopes - 40 Sets Theme - Christmas / Holiday Cheer Paper Thickness for both Letterhead & Envelope - 50 LB Text Letterhead Measurement - 8 1/2" X 11" Envelope Type - #10 (Measurement - 9 1/2" X 4 1/8") Printer Compatability - Inkjet, Laser, and Copier (Applies to Both Letterhead & Envelope)