Length * Width * Height:1. Opening size: 50 * 60 * 20cm (19.7 * 23.6 * 7.9 inches), folding size: 50 * 60 * 12cm (19.7 * 23.6 * 4.72 inches), weight: 2.1kg (4.63 pounds)2. Opening size: 50 * 80 * 20cm (19.7 * 31.5 * 7.9 inches), folding size: 50 * 80 * 12cm (19.7 * 31.5 * 4.7 inches), weight: 3.1kg (6.43 pounds)3. Opening size: 100 * 80 * 35/37/40cm (39.4 * 31.5 * 13.8/14.6/15.8 inches), with three adjustable heights. Folding size: 50 * 80 * 15cm (19.7 * 31.5 * 5.91 inches). Weight: 6kg (13.23 pounds)4. Opening size: 100 * 95 * 35/37/40cm (39.4 * 37.4 * 13.8/14.6/15.8 inches), with three adjustable heights. Folding size: 50 * 95 * 15cm (19.7 * 37.4 * 5.91 inches). Weight: 9kg (19.84 pounds)