They are available in the following sizes:
1m x 1m x 40mm, weight 9.5kg
2m x 1m x 40mm, weight 17.5kg
To create judo areas you will need the following numbers of mats (the red mats create a 1m wide line with a 1m run off beyond):
14m x 14m area requires 80 green mats and 18 red mats
12m x 12m area requires 58 green mats and 14 red mats
10m x 10m area requires 36 green mats and 14 red mats
8m x 8m area requires 22 green mats and 10 red mats