Premium PEX Tube: Material: Aluminum; Length: 4 ft; Amount: 200 pcs; Width: 4.25"; Excellent product to provide a superior heat transfer function for home and commercial radiant floor system. High Compatibility: Our radiant heat transfer plates are suitable for most type of 1/2" PEX tubing(5/8" OD). Compatible with most brands' PEX, PEX-AL-PEX or EVOH coated 'Oxygen Barrier' pipes. Easy Installation: Installed in radiant system of under-floor (between joist) type, sandwich type, above sub-floor(sleeper), wall & ceiling. Cuttable design to satisfy different needs. Notice: You should leave 1-2" spacing between plates when you set up. Thickness & Note: This in floor heat plates feature 0.016" standard thickness, can be stapled by hand or stapler. Its U-shaped design reduces thermal voids that occur from gaps between plates & tubes. Diverse Uses: Perfect to enhance heat transfer of the system and make the needed water supply temperature lower. Power-saving PEX heat transfer plates to use at home, apartment, hotel, etc. Number of Plates = Square Footage x 1.30 / length of plates. Example: 1000 Square Footage: Area Multiply by 1.30 = 1300ft of plates. (650 plates of the 2ft version OR 325 plates of the 4 ft version)