▁( US ▁letter ) ▁or ▁A 4 ▁s ized ▁sheets , ▁and ▁come ▁in ▁many ▁different ▁shapes , ▁sizes , ▁formats ▁and ▁materials . ▁Las er ▁label ▁material ▁is ▁a ▁non por ous ▁stock ▁made ▁to ▁with stand ▁the ▁inten se ▁heat ▁of ▁las er ▁printer s ▁and ▁cop iers . ▁A ▁draw back ▁of ▁las er ▁labels ▁is ▁that ▁the ▁entire ▁sheet ▁needs ▁to ▁be ▁printed ▁before ▁any ▁labels ▁are ▁used ; ▁once ▁labels ▁have ▁been ▁removed ▁the ▁sheet ▁cannot ▁be ▁put ▁through ▁the ▁printer ▁again ▁without ▁dam aging ▁the ▁printing ▁mechanism . ▁In k jet ▁label ▁material ▁is ▁a ▁por ous ▁stock ▁made ▁to ▁accept ▁in k ▁and ▁d ye ▁from ▁an ▁in k jet ▁printer . ▁ ▁One ▁of ▁the ▁more ▁modern ▁in k jet ▁label ▁material ▁stock s ▁is ▁water proof ▁print able ▁in k jet ▁material ▁commonly ▁used ▁for ▁soap ▁or ▁show er ▁gel ▁containers . ▁Security ▁labels ▁are ▁used ▁for ▁anti - counter fe iting , ▁brand ▁protection , ▁tam per - ev ident ▁se als ▁and ▁anti - p il fer age ▁se als . ▁These ▁combine ▁a ▁number ▁of ▁over t ▁and ▁cover t ▁features ▁to ▁make ▁reprodu ction ▁difficult . ▁The ▁use ▁of ▁security ▁printing , ▁h olog raph y , ▁emb oss ing , ▁bar codes , ▁R F ID ▁ch ips , ▁custom ▁printing ▁and ▁weak ▁( or ▁weak ened ) ▁back ings ▁is ▁common . ▁They ▁are ▁used ▁for ▁authentication , ▁the ft ▁reduction , ▁and ▁protection ▁against ▁counter fe it