double-sided

Short definition from Wiktionary

Adjective

1. 1
   Using or able to be used on both sides: Of paper, able to be used or printed on both sides.
2. 2
   Using or able to be used on both sides: Of adhesive tape, having an adhesive on both sides.
3. 3
   Using or able to be used on both sides: Of circuit boards, having printed circuits on both sides.