The Quadro Twist is our "Baby" and flagship string from YTEX! If you are looking for a very' SOFT co-poly and a SPIN Monster...then this string is for you! This is the absolute best' string on the market you can get besides natural gut! RSI (Racquet Stringers Industry) rated the Quadro #1 in spin and #2 overall out of 157 strings they playtested. Quadro Twist has outstanding tension hold and is also highly recommended for the main or cross in a hybrid combination. If you've never played with a poly string..then the Quadro is a great introduction for you to the poly world. Note: The BLACK COLOR on this string does play SOFTER than the white so be sure to get the right color according to what you are looking for in a string. The white color has a crispier feel and a bit stiffer than the black color. The Quadro is a little livelier so this one you can string a bit tighter than normal.