Glow In The Dark Silicone Tunnels are offered in pairs (2pcs) and sold in a range of sizes from 6G (4mm) to 1 & 1/2" (38mm). With a soft and squishy make, they have 1 - 2mm double flares and an appropriate wearable area for each size, starting from 6G (4mm) with 9mm, 9/16" (14mm) with 8mm, and 1 & 1/2" (38mm) with 12mm. Just hold up to a light source for 5 minutes to activate the glow in the dark effect. Great for healed lobes.