Size in mm average weight kg/mtr kg/ft 25 x 25 x 3 1.10 0.30 25 x 25 x 5 1.80 0.50 25 x 25 x 6 2.10 0.60 30 x 30 x 3 1.40 0.40 35 x 35 x 3 1.60 0.50 35 x 35 x 4 2.10 0.60 35 x 35 x 5 2.60 0.80 37 x 37 x 3 1.70 0.50 40 x 40 x 4 2.40 0.70 40 x 40 x 5 3.00 0.90 40 x 40 x 6 3.50 1.10 45 x 45 x 4 2.70 0.80 45 x 45 x 5 3.40 1.00 Size in mm Average Weight KG/MTR KG/FT 50 x 50 x 4 3.00 0.90 50 x 50 x 5 3.80 1.20 50 x 50 x 6 4.50 1.40 55 x 55 x 4 3.30 1.00 55 x 55 x 5 4.10 1.30 60 x 60 x 4 3.70 1.10 60 x 60 x 5 4.50 1.40 60 x 60 x 6 5.40 1.64 65 x 65 x 4 4.00 1.20 65 x 65 x 5 4.90 1.50 65 x 65 x 6 5.80 1.80 65 x 65 x 8 7.70 2.40 65 x 65 x 10 9.40 2.90 75 x 75 x 5 5.70 1.70 . Size in mm Average Weight KG/MTR KG/FT 75 x 75 x 6 6.80 2.10 75 x 75 x 8 8.90 2.70 75 x 75 x 10 11.0 3.40 75 x 75 x 12 13.1 4.00 90 x 90 x 6 8.20 2.50 90 x 90 x 7 9.50 2.90 90 x 90 x 8 10.80 3.10 90 x 90 x 10 13.40 4.10 100 x 100 x 6 9.20 2.80 100 x 100 x7 10.7 3.30 100 x 100 x 8 12.10 3.70 100 x 100 x 10 14.90 4.50 100 x 100 x 12 17.70 5.40 110 x 110 x 8 13.40 4.08 110 x 110 x10 16.50 5.03 110 x 110 x 12 19.6 5.97 .