1.   A final outer plastic sheath completes the wire.

2.   He took a scalpel from the pocket of his jacket and slipped the plastic sheath off its sharp blade.

3.   A new rug sits rolled up by the door, still in its plastic sheath.

4.   I sorted the pages, slipped them into full-page-sized plastic sheaths and stuck them in a closet.

5.   Polymers generally do not conduct electricity, which is why metal wires are wrapped with plastic insulating sheaths to prevent short circuits.

6.   The plastic sheath prevents the unwanted organisms from getting oxygen, and they die within three weeks, he said.

7.   The problem arises when the flat wire snaps and works its way through the plastic sheath into the heart, experts said.