These original spherical salutes were powerful enough to cause a legitimate safety concern. They were banned in the United States in 1966, by the federal Child Safety Act of 1966. Historically, these globe salutes and cherry bombs were made in two halves. One half was filled with powder and the other half was glued in place on top of it, and the whole globe was covered with glue-coated string or sawdust. This left an air-gap which created a louder bang when the case ruptured. Another source[which?] says they were originally charged with 5 to 10 times more explosive composition than was used in a standard one-and-a-half-inch (38 mm) paper firecracker. After the enactment of the Child Safety Act of 1966, all “consumer fireworks” (those available to individuals), such as silver tube salutes, cherry bombs and M-80s, were banned, and from then on, no cherry bomb or salute could contain more than 50 milligrams of powder mixture, about 5% of the original amount. The 50 mg cherry bomb law was passed in 1977.