1.Solar Collector can heat and cool the pool&spa temperature, 2.Low price,chlorine and UV,aging-resistant. 3.EPDM mat. Solar Collector:(1). 4 units of solar collectors,each is 33cm(1 m²).(2). 8 pieces of header kits on top and end side.(3). 2 pcs of end caps(4). 2 pcs of reduciton valve(5). 8 meters nylon roof straps(6). 4 pcs of splicing barbs and 4pcs of small binders(7). Leaflet