SIZE	INSIDE LENGTH (mm)	INSIDE WIDTH (mm)	WEIGHT/M (kg)
4	16	5	0.31
5	18	7	0.51
6	21	8	0.74
8	28	11	1.32
10	35	14	2.00
12	42	16	2.98
13	45	18	3.50
16	56	22	5.20
18	63	24	6.50
20	70	27	8.20
23	80	31	11.00
26	91	35	14.00