JP Enterprises Alternate Spring Pack For JpSCS-10 3 Spring Weights Black. These auxiliary spring rates for the JP Enterprises JPSCS-10 call for slightly heavier spring rates for greater trigger pulls while the slightly lighter spring rates call for slightly quicker trigger pulls. This JP Enterprises Auxiliary Spring Pack For JPSCS-10 comes in a pack of 3 and these alternate spring rates have been included. If you're looking for a spring pack for your JPSCS-10 just take a look at the data sheet (in pdf format scroll down the page). Note: The default spring rates are shown and may not be the same for the entire package as the color and shape of the springs included in the kit. Specifications for JP Enterprises Alternate Spring Pack For JPSCS-10: Manufacturer: JP Enterprises Color: Black Package Contents: JP Enterprises Auxiliary Spring Rate Kit For JPSCS-10 (pack of 3) JP Enterprises JPSCS-PACK10: Alternate Spring Pack For JpSCS-10 (3 Spring Weights) Black