| 摘要 |
The present invention relates to a dual-layer tube comprising: a first tube whose transmissivity measured by JIS K 7361-1 is greater than or equal to 73% based on the thickness of 1.48 mm; and a second tube which is formed on at least one of au outer side and an inner side in the first tube, and whose transmissivity measured by JIS K 7361-1 is less than or equal to 73% based on the thickness of 1.47 mm. |
