The black plastic lids are made from low-density polyethylene to provide good torque retention, making them reusable and durable. The poly caps will not rust over time. Ensure the diameter of the bottle mouth is 38mm before purchase, as the caps will not fit otherwise.

The raised ridge across the entire circumference of the cap makes it easier to hold and seal, providing a tight closure to prevent liquid leakage, carbonation loss, and gas leakage. This ensures a good, air-tight seal.

Convex details on the cap increase friction, making it easy to twist open. The sturdy plastic material retains its torque well, allowing for repeated use.

These 38mm poly screw caps can be used in a wide range of industries to produce a good sealing effect. They also make excellent replacement caps for 38mm wide glass growler bottles.

The package includes 24 pieces of the poly seal screw caps, providing extra caps on hand in case they are needed. These caps can meet the daily demands of food and liquid sealing.

In summary, these black plastic lids are made from durable, low-density polyethylene that won't rust. The raised ridge and convex details make them easy to grip and twist, providing a secure, air-tight seal to prevent leaks. They can be used across various industries and as replacement caps for 38mm bottles. The package includes 24 caps, ensuring you have spares available when needed for food and liquid sealing.

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