These capsule sinkers are made from spring tempered stainless steel 316 or PTFE coated over music wire.

The choice of sinker will depend on the tablet or capsule. The sinker should have minimal contact with the dosage form as this can affect the dissolution rate. The sinker should be heavy enough to sink the tablet/capsule to the bottom of the vessel. There are many varieties of sinkers including spiral, basket, pronged and spring style.