Blue PET plastic boston rounds are accompanied by black treatment or lotion pumps. The 1 oz, 2 oz, and 4 oz blue boston round bottles come with black treatment pumps, while the 8 oz and 16 oz sizes are paired with black lotion pumps. Each pump features a locking mechanism in the neck for secure storage. These plastic bottles could be used to dispense various bath and body and hair care products. As always, be sure to test these bottles and pumps with your product for proper compatibility.