O-Ring Kit Nitrile 90 Duro 396 Pcs. By Busy-Corner For Caterpillar, And Pumps. Product Details High Quality: Made of Nitrile (NBR) 90 shore material,are durable,high temperature resistance,anti static,oil resistant,UV resistance,heat resistant,wear resistant. Multi size: This handy kit contains 396pcs NBR o-rings in the 36 most popular sizes used on Caterpillar equipment. Wide Application: O-ring kit use for Caterpillar excavator. Handy Packing: Comes with a heavy duty storage case that keeps each size o rings separated and organized,that makes more convenient to carry, select and collect. Customer Service: You are unhappy for any reason, return your kit with no questions asked and BUSY-CORNER will provide a full refund. Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.