SINGLE ROPE FOR CELLO Single string for Celllo Kaplan Solutions KS512 Re (D) 4/4 medium tension. Kaplan Solutions Cello A and D strings produce a full, rich, and warm tone. It has been designed to allow greater projection in the highest register of the instrument, balancing and mixing the lower strings well. Designed for professionals, it stays firm under high arc pressure, and provides a strong tone, on its own, without being too bright. Kaplan Solutions strings for Cello are carved for a 4/4 instrument with a playable length of 700mm. Strong tension ropes have great projection and volume while soft tension ropes have a more comfortable bow response. Medium tension strings are optimized for most performers.