Self sharpening stainless steel blades with skin friendly rounded tips. Ultra powerful battery – up to 90 minutes of cordless usage with just 2 hour charge time Unique quad edge design to reach tough spots effortlessly Travel safe with travel lock and travel pouch included The trimmer blades come with prior lubricant coating. With usage, the lubricant might tend to dry up causing increased friction and resultant heating. It is recommended to use coconut oil to lubricate the underside of the blade if required