... The frame is strong :40mm*40mm 2.Easy open and close 3.Firm and durable Strong Iron ... Frame: steel: size:40mmx40mm .and the legs height can be adjustable. with rust proof painting. 4.Cover ... material: 420DPVC,also can be choosed as customer wanted. water,UV, fire ... :exhibition, fair, celebration, meeting, banquet in the open air, tourism, fight danger and disaster, do exercises ...