To create and ideate craft ideas is a very fulfilling experience Art and craft can be very therapeutic and can help bring out the artist or hobbyist in you Embark on your creative journey by making a selection from the widest range of arts and crafts supplies from us Features . Tyvek envelopes provide superior puncture tear and moisture protection. Colorful envelopes make your mailing stand out. Constructed from 14 lb olefin. Ten times stronger than paper envelopes. Feature self seal closure. Case of 100 Specifications . Color Black. Strength Material 14 lb Olefin. Country of Origin USA. Length 12 . Width 9