SASSY SILICONE MIXING CUPS Medium Sassy Silicone Mixing Cups are acrylic non-stick cups made of a special silicone rubber surface adaptable for dental acrylics, resins and cements. The cups are ideal for premixing acrylic because their wide suction-cup base prevents spillage and allows for instant removal of congealed acrylic. They are resistant to high temperatures. These mixing cups are available in two sizes: Medium and Large.