ProX XS-DF2020X20 20mm High Density Foam Cut Inserts for Utility Speaker Lighting Flight Case Rack Drawers DIY Cushion Pad - 20X20 in. Introducing ProX Precision Foam Inserts - the ultimate security solution for your ATA flight case needs. These OEM hard, high-density foam inserts fit perfectly in ProX road/flight cases as a replacement, or to add additional security to your gear. Choose from various thickness options for replacement or additional protection: