Perfume Studio 10ml Frosted Green Glass Roller Bottle for Essential oils with Metal Ball (10 Roll On Bottles, 1/3 oz) Set of 10 Units of Frosted Green Glass Rollers with Black Caps and metal ball applicators Specially Designed For Body and Essential Oils ONLY USE WITH PURE UNCUT OILS. DO NOT USE WITH FRACTIONATED COCONUT OIL BLENDS; METAL BALL WILL BECOME TOO LUBRICATED AND WILL POP OUT. Refillable Roller Bottles Dark Green Glass to Protect your oils from UV Light