These heavy cow hide laces are 1/8" wide and come on a 50 foot spool. This lacing is suitable for re-lacing baseball gloves.
Metric conversion for your reference: 1/8" = 3 mm; 50 feet = 15.24 m
Cows are not an endangered species. The leather is a by-product of the food industry. The cows are not killed just for the skin.