Each Everlast Professional Speed Bag has been sewn together by hand in order to meet the precision and perfection that every boxer has come to expect when they buy an Everlast product. The Everlast Professional Speed Bags are made from top-grade lightweight leather to increase durability and provide faster, accurate rebounds with every punch. New super-speed rubber bladders are inserted into the bag to ensure an even balance and to further improve the speed and accuracy of the rebounds.