Things 4 Strings® accessories are indeed universal-fit, One Size Fits All, useful for both children (as young as three) and adult hands.

The Bow Hold Buddies® set, if installed on the correct sized bow for the player, adjusts for a custom fit by sliding the Hold Fish® pinky support (included in the Bow Hold Buddies® set, and available seperately) along the bow stick to be up next to the ring finger.