This is sometimes referred to as 'bouncy bows' as the bow leaves the string between each stroke.

There are many different types of Spiccato stroke from a softly 'brushed' stroke, to a hard sound with more vertical movement.

The Hidersine Company, United Kingdom
C/o Barnes & Mullins Ltd, Grays Inn House, Unit 14, Mile Oak Industrial Estate, Oswestry, Shropshire, SY10 8GA