- The Rock Slide TRS-XSMM Minnie Marks Signature Hybrid Balltip (open end) aged brass slide; shaped balltip brass slide especially for small fingers; inner diameter: 15,8 mm; ring size: 4-6; material: aged brass, hybrid ball tip (open end) edition; on the side of the slide there is a groove with which the slide can be additionally supported by the adjacent finger. EUR 29.00 - See more - Buy online