The use of unsplit lamb gut, besides being closer to the historical reality of the string makers of the past, has also led to strings with unexpected superior acoustical and mechanical properties, as compared to those produced with gut strips. The HU type strings have a surface that has been smoothened only the minimum needed to guarantee that the string is not false; the string is then slightly oiled.
Standard length is 120 cm up to diameters of 1.90 mm. Starting from a diameter of 2.00 mm, the standard length changes to 180 mm only.

Are you maybe thinking about historical gauges for bowed instruments?
SKUGaugeLengthPriceBuyprice_hsort
38HU0.38 mm120 cm€4.60 + VAT
4.6
40HU0.4 mm120 cm€4.60 + VAT
4.6
42HU0.42 mm120 cm€4.60 + VAT
4.6
44HU0.44 mm120 cm€4.60 + VAT
4.6
46HU0.46 mm120 cm€5.00 + VAT
5
48HU0.48 mm120 cm€5.00 + VAT
5
50HU0.5 mm120 cm€5.00 + VAT
5
52HU0.52 mm120 cm€5.00 + VAT
5
54HU0.54 mm120 cm€5.90 + VAT
5.9
56HU0.56 mm120 cm€5.90 + VAT
5.9
58HU0.58 mm120 cm€5.90 + VAT
5.9
60HU0.6 mm120 cm€6.20 + VAT
6.2
62HU0.62 mm120 cm€6.20 + VAT
6.2
64HU0.64 mm120 cm€7.70 + VAT
7.7
66HU0.66 mm120 cm€7.70 + VAT
7.7
68HU0.68 mm120 cm€7.70 + VAT
7.7
70HU0.7 mm120 cm€7.70 + VAT
7.7
73HU0.73 mm120 cm€7.70 + VAT
7.7
76HU0.76 mm120 cm€9.20 + VAT
9.2
79HU0.79 mm120 cm€9.20 + VAT
9.2
82HU0.82 mm120 cm€9.20 + VAT
9.2
85HU0.85 mm120 cm€9.20 + VAT
9.2
88HU0.88 mm120 cm€9.20 + VAT
9.2
91HU0.91 mm120 cm€11.60 + VAT
11.6
94HU0.94 mm120 cm€11.60 + VAT
11.6
97HU0.97 mm120 cm€11.60 + VAT
11.6
200HU2 mm120 cm€26.90 + VAT
26.90
100HU1 mm120 cm€11.60 + VAT
11.6
104HU1.04 mm120 cm€11.60 + VAT
11.6
108HU1.08 mm120 cm€11.60 + VAT
11.6
112HU1.12 mm120 cm€14.90 + VAT
14.9
116HU1.16 mm120 cm€14.90 + VAT
14.9
120HU1.2 mm120 cm€16.80 + VAT
16.8
124HU1.24 mm120 cm€16.80 + VAT
16.8
128HU1.28 mm120 cm€16.80 + VAT
16.8
132HU1.32 mm120 cm€16.80 + VAT
16.8
136HU1.36 mm120 cm€16.80 + VAT
16.8
140HU1.4 mm120 cm€19.10 + VAT
19.1
145HU1.45 mm120 cm€19.10 + VAT
19.1
150HU1.5 mm120 cm€19.10 + VAT
19.1
155HU1.55 mm120 cm€19.10 + VAT
19.1
160HU1.6 mm120 cm€20.90 + VAT
20.9
165HU1.65 mm120 cm€20.90 + VAT
20.9
170HU1.7 mm120 cm€20.90 + VAT
20.9
180HU1.8 mm120 cm€24.00 + VAT
24
190HU1.9 mm120 cm€26.90 + VAT
26.9
200HU1802 mm180 cm€53.80 + VAT
53.8
210HU1802.1 mm180 cm€62.50 + VAT
62.5
220HU1802.2 mm180 cm€62.50 + VAT
62.5
230HU1802.3 mm180 cm€62.50 + VAT
62.5
240HU1802.4 mm180 cm€68.70 + VAT
68.7
250HU1802.5 mm180 cm€68.70 + VAT
68.7
260HU1802.6 mm180 cm€68.70 + VAT
68.7
280HU1802.8 mm180 cm€86.00 + VAT
86
300HU1803 mm180 cm€86.00 + VAT
86
320HU1803.2 mm180 cm€89.70 + VAT
89.7
340HU1803.4 mm180 cm€89.70 + VAT
89.7
400HU1804 mm180 cm€94.10 + VAT
94.1
420HU1804.2 mm180 cm€98.90 + VAT
98.9
440HU1804.4 mm180 cm€103.60 + VAT
103.6
460HU1804.6 mm180 cm€110.60 + VAT
110.6