Non-metallic scissors to trim tzitzit ends. 

• Made of zirconium oxide
• Does not require sharpening
• Very clean cut
• High quality handles
• Includes padded case

The Mishnah Berurah and Ben Ish Chai state that it is preferable to avoid trimming tzitzit with metal cutting.

With proper care, these ceramic scissors can last for many years, but they should be handled with care, because if dropped they are liable to shatter or chip.