50 PCS 21700 Fish-Paper Insulator Rings – Pure Fiber – Free Shipping

50 PCS 21700 Fish-Paper Insulator Rings — made from pure fiber paper for safe and durable battery pack insulation.

• Type: Fish-paper insulation rings
• Material: High-quality pure fiber paper
• Size: Fits 21700 lithium-ion battery cells
• Color: Black
• Purpose: Prevents short circuits and adds top insulation

Ships flat in a lightweight envelope to keep Free Shipping fast and affordable. Multiple packs may ship separately.