You can contact us at any time before or after the purchase to ask questions,our enthusiastic and responsible customer service is always ready to answer your questionsProduct Material:Aluminum alloy profileProduct Size：300MM,500MMApply to:Creality3d CR-10/10S/10S4,Alfawise U20,TEVO Tornado,Anet E12,etcApplicable printer models:Coreyity3d CR-10/10S/10S4,Alfawise U20,TEVO Tornado,AnetE12 and other similar models with print sizes of 300*300*400mm/400*400*400mm.Function:It is used to enhance the stability of the Z axis and improve the printing effect.Your satisfaction is our goal,we focus on quality,quality assurance,please rest assured that the purchase.