welcome to trussingchina - stage
often it is combine by two parts:
1) the stage top deck : it is the 18mm thickness plywood or 18mm thickness transparent glass
its the top special for the stage,  it is heavy loading weight, skid-proof, water-proof, fire-proof,
2) the stage aluminum frame : it is include the aluminum structure frame, stage leg,
and floor adjustable base , (it is with 20cm adjustable height when the floor is not on level)

the stage standard model is :
1) 1.22m*1.22m for each pcs ( 4ft*4ft for each pcs) , loading weight: 1150KG for each pcs
2) 1.22m*2.44m for each pcs ( 4ft*8ft for each pcs) , loading weight: 1500KG for each pcs
height often from 0.6m-0.8m-1.0m-1.2m adjustable ,
height from 0.2m to 2.0m can made by your require too .
for the combine stage, moving stage, mobile stage, portable stage, combine by pcs with pcs .