Thesashin hatimifasaha ce ta samar da wani ɓangaren samfur wanda aka lalata ta da ƙarfin nakasu a cikin wani nau'i ta hanyar wutar lantarki ta al'ada ko na'ura ta musamman, ta yadda za a sami siffa, girma da aiki. Sheets, molds da kayan aiki sune abubuwa uku na tambari. Stamping hanya ce ta sanyi nakasar karfe. Saboda haka, ana kiransa stamping sanyi ko tambarin takarda, wanda ake magana da shi azaman stamping. Yana daya daga cikin manyan hanyoyin sarrafa filastik karfe (ko sarrafa matsi) kuma yana cikin fasahar samar da kayan aikin injiniya.