Throttle Return Spring Assortment, Universal Carburetor Return Dual Spring (Compatible with Most 5-1/8 Carburetor Necks)Throttle Return Spring Assortment, Universal Carburetor Return Dual Spring (Compatible with Most 5-1/8 Carburetor Necks) Double spring combination, automatic reset, improves stability. Made of high-quality materials, durable, elastic, and not easily bent or deformed. Size: 4 x 0.88 x 0.88 inches.