VS650 IS A HIGH END, MINIMAL SLIDING SYSTEM FROM ALUMIL. IN THE ECLIPSE VERSION BOTH THE THRESHOLD AND THE FRAMES ARE FULLY HIDEN AND THE ONLY VISABLE PROFIL IS THE 25MM INTERLOCK. WITH VS650 YOU CAN HAVE PANELS UP TO 1000KGR THAT ALLOWS US TO REACH WIDTHS AND HEIGHTS THAT NO OTHER PRODUCT CAN.