Product Name: O-Ring Washer Kit Shape: Ring gasket Packed in plastic case for convenient use size: Outer diameter from 6mm to 28mm Material:Nitrile rubber colour:Black Package Contents: 100 * 6*1.5mm Seal Ring 20 * 17*2.4mm Seal Ring 100 * 6.5*1.5mm Seal Ring 20 * 18*2.4mm Seal Ring 100* 7*1.5mm Seal Ring 20 * 19*2.4mm Seal Ring 100 * 8*1.5mm Seal Ring 20 * 20*2.4mm Seal Ring 100 * 9*1.5mm Seal Ring 20 * 21*2.4mm Seal Ring 100 * 10*1.5mm Seal Ring 20 * 22*2. 4mm Seal Ring 100 * 11*1.5mm Seal Ring 20 * 23*2.4mm Seal Ring 100 * 12*1.5mm Seal Ring 20 * 24*2.4mm Seal Ring 50 * 13*1.5mm Seal Ring 10 * 25*3.1mm Seal Ring 50 * 14*1.5mm Seal Ring 10 * 26*3.1mm Seal Ring 50 * 15*1.5mm Seal Ring 10 * 27*3.1mm Seal Ring 50 * 16*1.5mm Seal Ring 10 * 28*3.1mm Seal Ring Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.