Unsplit lamb gut strings type HU

What is meant by unsplit lamb gut

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?
SKUGaugeLengthPriceBuyhf:att:pa_diametrohf:att:pa_lunghezza
38HU0.38 mm120 cm5.80 + VAT
0-38-mm-en120-cm-en
40HU0.40 mm, 0.4 mm120 cm5.80 + VAT
0-40-mm 0-4-mm-en120-cm-en
42HU0.42 mm120 cm5.80 + VAT
0-42-mm-en120-cm-en
44HU0.44 mm120 cm5.80 + VAT
0-44-mm-en120-cm-en
46HU0.46 mm120 cm6.30 + VAT
0-46-mm-en120-cm-en
48HU0.48 mm120 cm6.30 + VAT
0-48-mm-en120-cm-en
50HU0.5 mm120 cm6.30 + VAT
0-5-mm-en120-cm-en
52HU0.52 mm120 cm6.30 + VAT
0-52-mm-en120-cm-en
54HU0.54 mm120 cm7.40 + VAT
0-54-mm-en120-cm-en
56HU0.56 mm120 cm7.40 + VAT
0-56-mm-en120-cm-en
58HU0.58 mm120 cm7.40 + VAT
0-58-mm-en120-cm-en
60HU0.60 mm120 cm7.80 + VAT
0-6-mm-en120-cm-en
62HU0.62 mm120 cm7.80 + VAT
0-62-mm-en120-cm-en
64HU0.64 mm120 cm9.70 + VAT
0-64-mm-en120-cm-en
66HU0.66 mm120 cm9.70 + VAT
0-66-mm-en120-cm-en
68HU0.68 mm120 cm9.70 + VAT
0-68-mm-en120-cm-en
70HU0.70 mm120 cm9.70 + VAT
0-7-mm-en120-cm-en
73HU0.73 mm120 cm9.70 + VAT
0-73-mm-en120-cm-en
76HU0.76 mm120 cm11.60 + VAT
0-76-mm-en120-cm-en
79HU0.79 mm120 cm11.60 + VAT
0-79-mm-en120-cm-en
82HU0.82 mm120 cm11.60 + VAT
0-82-mm-en120-cm-en
85HU0.85 mm120 cm11.60 + VAT
0-85-mm-en120-cm-en
88HU0.88 mm120 cm11.60 + VAT
0-88-mm-en120-cm-en
91HU0.91 mm120 cm14.60 + VAT
0-91-mm-en120-cm-en
94HU0.94 mm120 cm14.60 + VAT
0-94-mm-en120-cm-en
97HU0.97 mm120 cm14.60 + VAT
0-97-mm-en120-cm-en
100HU1 mm120 cm14.60 + VAT
1-mm-en120-cm-en
104HU1.04 mm120 cm14.60 + VAT
1-04-mm-en120-cm-en
108HU1.08 mm120 cm14.60 + VAT
1-08-mm-en120-cm-en
112HU1.12 mm120 cm18.80 + VAT
1-12-mm-en120-cm-en
116HU1.16 mm120 cm18.80 + VAT
1-16-mm-en120-cm-en
120HU1.2 mm120 cm21.20 + VAT
1-2-mm-en120-cm-en
124HU1.24 mm120 cm21.20 + VAT
1-24-mm-en120-cm-en
128HU1.28 mm120 cm21.20 + VAT
1-28-mm-en120-cm-en
132HU1.32 mm120 cm21.20 + VAT
1-32-mm-en120-cm-en
136HU1.36 mm120 cm21.20 + VAT
1-36-mm-en120-cm-en
140HU1.4 mm120 cm24.10 + VAT
1-4-mm-en120-cm-en
145HU1.45 mm120 cm24.10 + VAT
1-45-mm-en120-cm-en
150HU1.5 mm120 cm24.10 + VAT
1-5-mm-en120-cm-en
155HU1.55 mm120 cm24.10 + VAT
1-55-mm-en120-cm-en
160HU1.6 mm120 cm26.40 + VAT
1-6-mm-en120-cm-en
165HU1.65 mm120 cm26.40 + VAT
1-65-mm-en120-cm-en
170HU1.7 mm120 cm26.40 + VAT
1-7-mm-en120-cm-en
180HU1.8 mm120 cm30.30 + VAT
1-8-mm-en120-cm-en
190HU1.9 mm120 cm34.00 + VAT
1-9-mm-en120-cm-en
200HU1802 mm180 cm68.00 + VAT
2-mm-en180-cm-en
210HU1802.1 mm180 cm79.00 + VAT
2-1-mm-en180-cm-en
220HU1802.2 mm180 cm79.00 + VAT
2-2-mm-en180-cm-en
230HU1802.3 mm180 cm79.00 + VAT
2-3-mm-en180-cm-en
240HU1802.4 mm180 cm86.90 + VAT
2-4-mm-en180-cm-en
250HU1802.5 mm180 cm86.90 + VAT
2-5-mm-en180-cm-en
260HU1802.6 mm180 cm86.90 + VAT
2-6-mm-en180-cm-en
280HU1802.8 mm180 cm108.70 + VAT
2-8-mm-en180-cm-en
300HU1803 mm180 cm108.70 + VAT
3-mm-en180-cm-en
320HU1803.2 mm180 cm113.40 + VAT
3-2-mm-en180-cm-en
340HU1803.4 mm180 cm113.40 + VAT
3-4-mm-en180-cm-en
400HU1804 mm180 cm119.00 + VAT
4-mm-en180-cm-en
420HU1804.2 mm180 cm125.10 + VAT
4-2-mm-en180-cm-en
440HU1804.4 mm180 cm131.00 + VAT
4-4-mm-en180-cm-en
460HU1804.6 mm180 cm139.90 + VAT
4-6-mm-en180-cm-en
200HU2 mm120 cm34.00 + VAT
2-mm-en120-cm-en