Bulk Roller Bottles - 200 pcs, 10ml with Stainless Steel Metal Ball and Black Cap From Perfume Studio&reg; Perfume Studio Bulk Roller Bottles with Metal Balls - 200 Units -10ml, Black Caps IMPORTANT! USE ONLY WITH UNCUT OILS. DO NOT USE WITH FRACTIONATED COCONUT OILS OR OTHER SIMILAR HIGH LUBRICANTS. THESE TYPE OF LUBRICANT OILS WILL FORCE THE METAL BALL TO POP OUT. Stainless Steel Metal Ball For Optimum Application Bottles, Caps, and Metal Balls Packaged Separately. Bulk Roller Bottles for Essential and Fragrance Oils (200 Bottles)