specifications︰ Diameter and price as follow:
7cm......USD0.35/pc
9cm......USD0.42/pc
12cm....USD0.53/pc
15cm....USD0.60/pc
18cm....USD0.67/pc
21cm....USD0.77/pc
24cm....USD0.90/pc
26cm....USD1.04/pc
28cm....USD1.18/pc
30cm....USD1.32/pc