Buy the Ja-Ru Light Up Finger Optics at Michaels. com. These light-up finger optics are perfect to jazz up a birthday party. These light-up finger optics are perfect to jazz up a birthday party. Your kids can wear these fiber optics on their fingertips, and let the beaming lights leave their friends amazed. Details: Red, blue and green 5" x 9" (12.7cm x 22.86cm) package size 3 finger optics Lights up Plastic, sand and metal Requires non-replaceable batteries (included) For ages 4 and up | Ja-Ru Light Up Finger Optics | Michaels.