DuPont Tyvek® Resealable Interoffice Envelopes with Velcro® Closure Almost impossible to rip or puncture Antistatic, water- and chemical-resistant, yet easy to write on Printed on two sides 100% recyclable 100 envelopes per box. 9-1/2 x 12-1/2 WEIGHT: 4 lbs. SOLD AS: Box STOCK NUMBER: R2350