2 pcs Ring:1pcs 7:17.4mm & 1pcs # 8:18.2mmWorkout,biking,swimming,manual labor or any other physical activitiesKeep yourself safe from extreme conditions like ring avulsion and amputationHypoallergenic,high quality and flexible silicone ringsFor anniversaries,birthdays,Father's Day,weddings and moreColor:BlackMaterial:SiliconeDimensions:# 7:17.4mm & # 8:18.2mmPackage Contents:2 x RingOnly 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.