The material:iron The height:90-140 cm It has positive locking button The triange is the most stable shape High-grade large music stand:description:Height : 90-140cm Tube diameter: 22mm, 28mm,Ware side: 50cmx35cmWeight: 3kgcolour :blackUse: music book and music textAdjustable,Foldable ,Portable High-grade large music stand, metal music stand, mini music stand