As always, Oster® continues to offer the highest quality products with the power and reliability you demand. Virtually maintenance free. Single Speed and Variable Speed Clipmaster® Clippers stay oiled for up to 100 hours of run time. The variable speed clipper easily adjusts from 700 to 3000 strokes per minute, yet always remain cool and quiet. Specialized zinc cast iron fan and additional air holes keep head temperatures down by 28% to ensure animals are cool and comfortable. Titanium blades are included with both of these exceptional clipper models.