disposable ashtray household environmental protection prevent fly ash office throw lazy people smoke removal sand to extinguish cigarettes ktv internet coffee

60 (30 ashtrays and sand to extinguish cigarettes each) 100 (50 ashtrays and sand to extinguish cigarettes each) 200 (one hundred ashtrays and one hundred sand to extinguish cigarettes each) 400 (200 ashtrays, sand to extinguish cigarettes each) 50 ashtrays 0 sand to extinguish cigarettes 100 cylinders 0 sand to extinguish cigarettes 200 ashtrays 0 sand to extinguish cigarettes 100 bags sand to extinguish cigarettes (mixed color) 50 bags sand to extinguish cigarettes (mixed color) 200 bags sand to extinguish cigarettes (mixed color)

color mixing