So what makes these bottle easy to squeeze? Our plastic squeeze bottles with cap are made from LDPE (Low-density polyethylene) plastic. This plastic has a lower density which makes it more pliable and easier to squeeze, but yet just as durable as a more rigid bottle made from high density plastic. They are great for kids or people with a weak hand grip. Our caps screw on and the lid cover is attached with a plastic hinge. The dispensing hole is 3/8 inches wide, allowing for thicker liquids to dispense easily. The black cap comes with a foil seal that can be used for extended storage, gift giving of your homemade items and safe travel/transportation. It easily is removable if it is not needed. The bottle is dishwasher safe on top rack.