They are round shape with stainless steel wires. Change your arrays if they have been using for long time.

White x 2	Black x 2

• 0.25 inch phono jack, fits most ionic detox foot spas.
• Array lasts between 30-50 sessions ( 30 mins per session).
• Warming: There is no such array can last up to 60 times.

• Array lasts between 40-50 sessions ( 30 mins per session).
• Standard size (0.25 inch phono jack) compatible with all ionic foot bath machines.
• Double rows of coils instead of single one more durable and effective.
• Stainless steel for superior performance and longevity.
• Low maintenance-just flush it with water.
• 2 Arrays are included in package.