Rubber catheter type feeding tubes come in "French" sizes from 3-34. The smaller the number, the smaller the tube. The smallest one I use is an 8 and I use that on all baby chicks. I think metal crop tubes are sized in gauges, so for those the smaller the number, the larger the tube. The sizes I use most are 8, 10, 16,18 and 30.
Here is the size 8
The 30
http://www.greatmedicalsupplies.com...l-purpose-robinsonnelaton-catheter-351030.htm
The 28
http://www.greatmedicalsupplies.com...l-purpose-robinsonnelaton-catheter-351028.htm
The 26
http://www.greatmedicalsupplies.com...l-purpose-robinsonnelaton-catheter-351026.htm
The 24
http://www.greatmedicalsupplies.com...l-purpose-robinsonnelaton-catheter-351024.htm
The 22
http://www.greatmedicalsupplies.com...l-purpose-robinsonnelaton-catheter-351022.htm
The 20
http://www.greatmedicalsupplies.com...l-purpose-robinsonnelaton-catheter-351020.htm
The 18
http://www.greatmedicalsupplies.com...l-purpose-robinsonnelaton-catheter-351018.htm
The 16
http://www.greatmedicalsupplies.com...l-purpose-robinsonnelaton-catheter-351016.htm
The 14
http://www.greatmedicalsupplies.com...l-purpose-robinsonnelaton-catheter-351014.htm
The 12
http://www.greatmedicalsupplies.com...l-purpose-robinsonnelaton-catheter-351012.htm
The 10
http://www.greatmedicalsupplies.com...l-purpose-robinsonnelaton-catheter-351010.htm
The 8
http://www.greatmedicalsupplies.com...l-purpose-robinsonnelaton-catheter-351008.htm
-Kathy
Here is the size 8
Here are the sizes
The 30
http://www.greatmedicalsupplies.com...l-purpose-robinsonnelaton-catheter-351030.htm
The 28
http://www.greatmedicalsupplies.com...l-purpose-robinsonnelaton-catheter-351028.htm
The 26
http://www.greatmedicalsupplies.com...l-purpose-robinsonnelaton-catheter-351026.htm
The 24
http://www.greatmedicalsupplies.com...l-purpose-robinsonnelaton-catheter-351024.htm
The 22
http://www.greatmedicalsupplies.com...l-purpose-robinsonnelaton-catheter-351022.htm
The 20
http://www.greatmedicalsupplies.com...l-purpose-robinsonnelaton-catheter-351020.htm
The 18
http://www.greatmedicalsupplies.com...l-purpose-robinsonnelaton-catheter-351018.htm
The 16
http://www.greatmedicalsupplies.com...l-purpose-robinsonnelaton-catheter-351016.htm
The 14
http://www.greatmedicalsupplies.com...l-purpose-robinsonnelaton-catheter-351014.htm
The 12
http://www.greatmedicalsupplies.com...l-purpose-robinsonnelaton-catheter-351012.htm
The 10
http://www.greatmedicalsupplies.com...l-purpose-robinsonnelaton-catheter-351010.htm
The 8
http://www.greatmedicalsupplies.com...l-purpose-robinsonnelaton-catheter-351008.htm
-Kathy
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