Metal or aluminium Good appreance,white color Adjustable core for different air way Size:dia 150,200,250,300,350 Best price Ball jet diffuser,jet diffuser,air diffuser ,diffuser1/.EXCELLENT THROW2/.ADJUSTABLE AIR FLOW3/.DURABLE4/.Material: aluminium5/.Pleasing appearance...no injection on the face6/.Standard package as request7. Standard white colour8/.Neck size:dia 100,150,200,250,300,350, ...