With the Extension Quarter Blackriver releases the third version after the Quarter Low and Quarter High. The different levels in the coping open up countless possibilities for technical tricks, which so far were only possible in the Winkler Mini DOS.
length: 23,5cm (9.25 inch)
width: 24,5 (9.65 inch)
height: 14cm (5.51 inch) and 17cm (6.69 inch)