8k cardboard color a4 thick handmade large 4k cardboard children student black white hard card folder color greeting card

a4 [210mm * 297mm]] a3 [297mm * 420mm]] 8k [260mm * 370mm]] 4k [370mm * 520mm]]

20 sheets cardboard [10 colors]] 40 sheets cardboard [10 colors]] 50 sheets cardboard [12 colors]] cardboard 60 sheets-30 colors 60 sheets cardboard [10 colors]] 100 sheets cardboard [10 colors]] black cardboard 20 sheets white cardboard 20 sheets bright red cardboard 20 sheets sky blue cardboard 20 sheets grass green cardboard 20 sheets orange cardboard 20 sheets light pink cardboard 20 sheets medium yellow cardboard 20 sheets light purple cardboard 20 sheets dark purple cardboard 20 sheets brown cardboard 20 sheets gray cardboard 20 sheets rose red cardboard 20 sheets 60 sheets cardboard [30 colors]]