CPR Pocket Mask W Hard Case & One Way Valve & O2 Inlet Skin Care Replacement Caster 4 *Twin Select Ear:Left Ear Replacement Caster 4 *Twin Wheel Casters Have Threaded Stem For Extra Security And Safety *MJM's Exclusive Reinforced Caster System Allows Additional Structural Support To Our Entire Product Line Our Positive Engaging Lock Holds The Wheel Securely So There Is No Swivel Movement When Locked *The Unique Design Allows Easy Movement On Hard Surfaces And Helps Eliminate the Wheel From Falling Into Cracks *Soft Non Marking Tread (It Will Not Leave Black Marks Or Leave Groves In Wood Or Vinyl) *Quiet Mobility (Hard Treads Make A Lot Of Noise)*Non Rust Plastic Body And Wheels *High Load Capacity (160 lbs) *Non Slip Tread * Lightweight: Easy to handle and carry at just 3 * A soft flexible dome that can be easily squeezed around the nose mouth and chin of the victim * A standard 15 mm port that can be used with bag mask resuscitation units or aerosol tubing * A compact mask valve with quick two piece assembly * Features elastic strap * Latex Free * Fully assembled ready to use * Features mask with O2 inlet one way valve filter head strap and gloves * One way valve and filter prevents backflow of air contaminants from patient to rescuer