French oak Spirals. 2 pack. Medium toast. 8" long, 7/8" diameter. The oak infusion spiral gives you the economic advantage and surface area of wood chips without the mess. Since these spirals do not need to be filtered or strained from wine or spirits, you have much more control over the total amount of extraction. Extraction also tends to be quick and complete. The spirals can also be split to add smaller amounts to the wine. Extraction is complete in six weeks. One spiral treats 3 gallons of wine.