Duck Brand Twist-N-Pull Tamper-Evident Mailing Tube, 2 x 18 Inches, White, 12-Pack (1176733) Durable construction with plastic caps that snap securely in place Pack of 12 tubes Innovative tab and slot locking system Two tamper-evident locking clips Great for mailing and storage Unlock the mailing tubes by twisting the cap until its aligned with the holes and pull the lid off to open it