HD10030T is the common size for underwear and bra straps. When it is used in bikini, it is usually connect the main fabric as elastic invisible belt. We have two TPU raw material for bikini clear straps: Taiwan material and Germany material. For such a narrow size like 10 mm wide, the transparency and surface won't have a lot differece between tape made from these two different materials.
Although the clear elastic tape made from Taiwan material will has lower price than that made from Germany material, we still recommend the more expensive one. Because a tape for bikini should have higher standard about yellowing resistance and salt tolerance. TD Series (Germany material clear elastic TPU tape) owns yellowing class in grade 4-5. And TD Series tape haven't any change soaked into highly saline water in one month.