Turbo offers their Switch Grip Interchangeable Finger Inner Sleeve as part of their Switch Grip Finger Assemblies. This product is perfect for bowlers who are plagued with release issues or fit issues due to finger swelling. The same locking technology that Turbo uses for their Thumb Assemblies was used for their Finger Assemblies. The Assembly system consists of the removable Finger Inner Sleeve that fits and locks into the permanent Outer Sleeve (Outer Sleeve sold separately) which is installed into the finger hole. This system makes it easy to quickly change insert sizes.