The blast machine packages on this page include portable classic-style machines with TLR pneumatic pressure-release remote controls. Pressure-release remote controls depressurize the blast machine whenever the RLX handle is released. Each package includes an Apollo 600 HP DLX helmet for use with compressed air as the breathing-air source. All standard classic-style 3.0 cuft and 6.0 cuft blast machines on this page have a working pressure rating of 150 psi. Blast machine capacities, stated in pounds, refer to abrasives (such as mineral slag) which weigh about 100 lbs per cuft. Comparatively, steel grit weighs 250 lbs per cuft.