This product is a variation of ReBOSSIS (cottony-type, synthetic bone-void-filling material). QDS stands for Quick Delivery System, literally meaning that this system is designed to fill ReBOSSIS in a difficult target bone void in a quicker way by use of syringe. The use of syringe enables a doctor to fill ReBOSSIS easily into a deep and/or narrow bone void. This product is made of two (2) sets of syringes containing 0.25(2cc) ReBOSSIS each. This product is available only in USA.