Prime Source LET disposable glove in Small. The glove is not sterile, but is suitable for use in the food and health sector as well as work in wet environments. The glove is blue, powder-free and made of synthetic nitrile rubber. Prime Source disposable gloves are available in sizes XS – XL and are color coded on the package so it is easy to tell the difference. Prime Source is a series of cleaning accessories and products that get you from A to Z without compromising on quality. The series contains both traditional and Svanmarked products.