Track your bike in the event of theft using this Apple AirTag from Topeak. Fitted with anti-theft bolts, this AirTag fits under your bottle cage or use separately. *AirTag is a registered trademark of Apple Inc. COMPATIBILITY Use alone or combine with any bottle cage on water bottle bosses. ANTI-THEFT BOLTS Two anti-theft stainless steel bolts and Allen wrench included. Specifications: MATERIAL - Engineering grade polymer COMPATIBILITY - Apple AirTag, any bottle cages SIZE - 7.7 x 3.45 x 0.9 cm / 3" x 1.36" x 0.35" WEIGHT - 8 g / 0.28 oz