The GBU-39 Small Diameter Bomb (SDB) is a 110 kg precision-guided glide bomb designed to provide aircraft with the ability to carry a higher number of precision strike weapons. It allows US Air Force aircraft to carry a pack of four GBU-39 SDBs in place of a single (907 kg bomb.
The video below was originally released by SouthFront in April 2019:
…The prime striking weapon used by the IAF is the GBU-39 Small Diameter Bomb (SDB). Vestiges of these bombs are often being found on sites of the Israeli strikes. In particular, GBU-39 SDBs were employed on March 28 when the IAF targeted supposed Iranian targets in Aleppo city.
The GBU-39 SDB is precision-guided glide bomb developed to provide aircraft with the ability to carry a higher number of more accurate bombs. The GBU-39, which was first introduced by Boeing in 2006, has a standoff range of more than 110km due to its pop-out wings. The 250lb (113.6kg) bomb uses an inertial navigation system (INS) and GPS to hit static targets with high accuracy, although it has only 22.7kg of explosives.
Another GBU-39 advantage is its stealthy signature. The bomb has a length of 1.8m and a diameter of 0.19m, but its radar cross section of 0.015m2 only. This creates additional difficulties for enemy air defense systems in the event of a massive strike with the usage of GBU-39 bombs. In September 2008, Israel receives approval from the US Congress to purchase 1,000 bombs. Israel was the first country outside of the US to receive the weapon.