1. Material: plastic 2. There is a sealing ring inside, dust-proof/leakage-proof 3. The top of the sealing cap, the inner thread is clear 4. Size: large size 19.9x22mm, inner diameter 16.8 mm, small size 18.4x22mm, inner diameter 13.9 mm 5. Weight: large size 4 grams, small size 2 grams
1. 材质:塑料 2. 内有密封圈,防尘/防渗漏 3. 密封帽顶,内螺纹清晰 4. 尺寸:大号19.9x22毫米,内径16.8毫米,小号18.4x22毫米,内径13.9毫米 5. 重量:大号4克,小号2克
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