Check the listing for details. 6Pcs Lighted Nocks for Arrows with .244"/6.2Mm inside Diameter.Automatic L. Color: green, Condition: New. Listed at 27.99 USD. Please don't doubt about the price. The lighted nocks is sturdy and of very good quality.Very high cost performanceThe slide switch can be easily turned off. No tools requiredThe Lighted nocks for arrow is very bright, you can easily find your arrow and prey during the day and nightSuitable for arrows with 6.2mm/.244" inner diameterLithium battery life up to 48 hours Battery: The battery capacity is large, and the manufacturer promises to use it continuously for 48 hours.The actual use is very bright in the first three nights, and slowly weakens by the fourth night. Do not throw away the battery after the battery becomes weak. It can be used for several hours, so that the electricity is completely used up repeatedly, and the battery is sealed and stored separately to prolong the service life of the battery. How to use: The tail of this arrow does not need to be lighted in advance, and the string automatically lights up when it is shot. Divided into five colors: red, yellow, blue, green, and white (7 colors flash after shooting, very dazzling!) This is a product that will make you worthy of your heart. The quality of the product is very good, the stability is very good, and the cost performance is very good. Very bright, you will very easily find it. Please believe , you deserve it