Layin ya ƙunshi nau'ikan injuna daban-daban, gami da injin blister, carton, da mai lakabi. Ana amfani da injin blister don samar da fakitin blister, ana amfani da carton ɗin don haɗa fakitin blister a cikin kwali, sannan a yi amfani da mai lakabin don shafa takalmi a cikin kwali.