Roller stool silver in size M with new base design: with saddle seat or round seatgas spring length / seat height: 50 and 70 cmsolid manufacturing from full aluminumfootrest design with slight curves reinterpreted in classic design languagesecure seat of the gas spring due to reinforced conereliable technology and durability, tested and certified by TÜV Rheinland and BIMFA Saddle seat: W x D x H: 38.5 x 37.5 x 8 cmergonomic: comfortable sitting, fatigue-free workingdue to the integrated leg recesses, relief of the legs and good support, also to the frontall advantages of the round seat includedRound seat: Ø 34 cm, seat height 7.5 cmdimensionally stable and elastic thanks to high-quality cold foamdurable, abrasion resistant, easy to clean due to excellent upholsteryexclusive all-aluminum mount for the gas spring