Perfume Studio Amber Color Roll Ons With Metal Ball Applicator- 10 ml - 1 Unit. As opposed to plastic balls that are rigid and penetrable, risking contamination of toxins on your oils over time, stainless steel metal balls are impenetrable and less susceptible to contamination, and will give you the smoothest application on your skin. IMPORTANT NOTICE: Unlike other metal rollers, these Rollons are 100% leak proof and as such the metal ball is very tight in the housing to prevent leaking and may need to be loosen before the first use by simply rolling the ball a few times over a clean surface until you see the metal ball starts rolling. GUARANTEED AGAINST LEAKS. These Perfume Studio essential oil Roll ons have been factory and field tested for leaks. If you encounter any leak problems with these metal roller balls you may contact us for a free replacement/refund on your purchase. Roll On is specially shielded on the outside of the glass to provide the best echo-friendly protection against harmful UV light that can harm your essential oils Additional Details ------------------------------ Package quantity: 1 Warranty: 90-day guaranteed against leaks/defects. These perfume studio essential oil roll ons have been factory and field tested for leaks. If you encounter any leak problems or defects with these metal roller balls within 90 days of purchase, you may contact us for a free replacement/refund on your purchase.