Easily adjusts while wearing for a perfect fit. Fits most men, and safe with use with lube. Secure locking system holds tight, even when lubed. Designed 13 size increments and precision construction, plus a quick release mechanism. Measurements: Fits men between 1.8 and 2.3 inches in diameter. Material: TPE and PE. Color: Black. Note: Ring is designed to be worn behind the cock and balls