SILICON GUN (YELLOW) is also known as caulking gun. Meant for fitting in a tube of silicon and then effectively discharging the silicon within the tube. The amount of silicon applied is depending on how fast the gun is moved when squeezing the trigger. The harder the pressure on the trigger, the more silicon will be released. The product is made of tougher and more durable materials, it differs from the common orange caulk gun in design, the rounded supporting rods give it extra strength and greatly enhances the durability.