This is 4 prebuilt Fused Clapton Coils. the core is made with dual 24 gauge nichrome wire for very fast heating time. It's wrapped with 32 gauge a1 kanthal wire. The ohms are .2 with 5 wraps. The Inner Diameter is 2.5mm. The kit includes 2 pads of Koh Gen Do Organic Japanese Cotton. PLEASE USE AT YOUR OWN RISK.