Suction cup with double wall made from Recycled 304 Stainless Steel and 350 ml giant capacity that is good for daily consumption. High quality food grade silicone sealing ring that guarantees 100% leak proof. Magical grip pad that greatly reduces spillage occurrence.Steel is one of the most demanded materials and can be found almost everywhere, from daily use products to large constructions.  Properly treated, it allows obtaining new resources for infinite use. Strong suction never fall over. Pick up easily by vertical lift. BPA Free.