The Vruk is both a bass drum pedal attachment and a method of playing.

As equipment, it is a spring that attaches to the footboard and allows for greater control of the pedals.

As a method it differs radically from heel-toe technique

Heel-Toe Technique

Heel-toe technique is a method of playing double strokes on the bass drum, hi-hat, or other pedals. More recently, this method has been used in the World's Fastest Drummer competition to set speed records.-Description:...

. Rather than being a shuffle as so-called ballistic technique, it is a smoother rocking motion. And is a faster way to get more BPM.