You have chosen the type of head you wanted to work with, now you can choose the type of shank you want to have. Most combinations are possible, but each project will have its requirements and thus should be considered as unique.
Very important is to test your bottle in our lab to precisely measure the bore entry.
The tolerances between the bottle technical specifications and the shank are essential to be controlled. For most existing bottles the work has already been done but for new version this is a step to be added.

You either go down the natural cork option or the synthetic

Here are the most common shank options:

Natural Cork: if you choose to work with natural cork you need to know that there are various levels of cork quality and that this can be suitable for one type of drink or another. This has a significant impact on the cost and when comparing prices, you should make sure to compare quality level or the blend proposed.
The industry standard for drinks is: FLOR -> EXTRA -> SUPERIOR -> 1st. In essence the less impurities and the smoother the cork the higher the quality.
This is important for wine but less so for spirits as the cork purpose is to open and close the bottle. Cork being a natural product it more expensive and sensitive to temperature variation, prolonged period in the bottle and can over time degrade when exposed to alcohol. There is also the option for agglomerated cork, commonly referred to MICRO cork (this is a natural cork broken into micro pieces 0.5mm granule size, mixed with glue and extruded or moulded) again there are advantages and disadvantages linked to price (less expensive), strength and elasticity. For wine there are other cork options including colmated or agglomerated

Synthetic Shank
If you choose to work with synthetic shank you need to know that there are various options available. The straight synthetic, the cork imitation and micro look that has natural cork micro dust inside of the synthetic shell. For synthetic shanks we have specific mould sizes and based on lab results we determine if it needs or not to have a side channel to eliminate po-up.