Made of bamboo fibers and sugar cane starch Biodegradable Reusable Flatware Cleverly-designed (fork’s got beveled edges that let it double as a knife) Compost-friendly – everything is made from sugar cane starch and bamboo fiber (no plastic here!) Sustain-ably sourced Set includes: 12 Eco spoons and 12 Eco Knork forks Approx 6.75″each About the Astrik material: –Dishwasher-friendly, durable and reusable with a recommended lifetime of 400 washes. –Biodegradable by design – meant to last about a year with use and reuse. –We’ve safely tested our Eco utensils up to 200 degrees Fahrenheit in a commercial dishwasher, but prolonged exposure at higher temperatures than that is not advised (i.e. dishwashers with a “heavy duty” high heat wash cycle, using the utensils to stir or cut food directly out of the microwave or oven, which usually boast temperatures far higher than 200 degrees. However, just because a utensil becomes warped, it is not permanent. If you were to heat it up again, it would become pliable enough to bend back into its normal form, and would be safe to use again.