– This is a bottle cap that you can attach on top of bottles to prevent paint dripping – You can keep it attached when you close lid. – No required any complicated steps, you can simply attach it on bottle with one touch. – HighAirtightness – This model is specifically designed for Tamiya Enamel 10mm Bottle. 5 varieties – Tarena Inner Cap [01] (for Tamiya Enamel 10ml Bottle): Approx. 19 H12mm – Tarena Inner Cap [02] (for Tamiya acrylic / lacquer 10ml bottle): Approx. 29 H11mm – Tarena Inner Cap [03] (for Mr. Hobby 10ml bottle): Approximately 29 H14mm – Tarena Inner Cap [04] (for Gaia Notes 15ml bottle): Approximately 25 H15mm – Tarena Inner Cap [05] (for Gaia Notes 50ml bottle): Approx. 41 H23mm Qty: 6