Polypropylene Material. Stainless Steel Blades. Patented Blade System Will Allow Up To 2,000 RPM's. Create Shakes, Salsa or Smoothies On The Go. Twist Bottom To Blend Or Roll Along A Clean, Dry Surface At A 45° Angle. Snap-On, Spill-Resistant Flip Top Lid. Meets FDA Requirements. BPA Free. Hand Wash Recommended.