{"product_id":"shiftmass™-new-knob-head","title":"ShiftMass™ Arc — Knob Head","description":"\u003cp style=\"text-align: left;\"\u003eThe ShiftMass™ Arc Head is the heaviest head in our \u003cbr\u003elaunch lineup at 146g. It's a contoured profile wrapped \u003cbr\u003ein hand-sewn Charcoal Alcantara over a precision-machined \u003cbr\u003e6061-T6 aluminum core. Like every ShiftMass head, it \u003cbr\u003ethreads onto the base — no adapters needed.\u003c\/p\u003e\n\u003cp style=\"text-align: left;\"\u003eAlready own a ShiftMass Complete System? Swap to Arc by \u003cbr\u003ehand. The base stays where it is; the head threads on \u003cbr\u003ecleanly.\u003c\/p\u003e\n\u003cp style=\"text-align: left;\"\u003eWhat's Included:\u003cbr\u003e- ShiftMass™ Arc Head in Charcoal Alcantara\u003c\/p\u003e\n\u003cp style=\"text-align: left;\"\u003eFeatures:\u003cbr\u003e- 146g head weight — heaviest in the launch lineup\u003cbr\u003e- Contoured profile with a weighted, hand-filling presence\u003cbr\u003e- Charcoal Alcantara, hand-wrapped and sewn in-house\u003cbr\u003e- Compatible with all current and future ShiftMass bases\u003cbr\u003e- Hand-swap design — no tools required once the base is set\u003c\/p\u003e\n\u003cp style=\"text-align: left;\"\u003eBuilt entirely in a small USA machine shop in Texas.\u003c\/p\u003e\n\u003cp style=\"text-align: left;\"\u003e- Aluminum core machined from 6061-T6\u003cbr\u003e- Alcantara wrapped and sewn in-house\u003cbr\u003e- Designed, machined, wrapped, and assembled by hand\u003c\/p\u003e\n\u003cp style=\"text-align: left;\"\u003eNotes:\u003cbr\u003e- Head-only product. Requires a ShiftMass™ Weight-Adjustable \u003cbr\u003e  Base, sold as part of our Complete System kits.\u003cbr\u003e- Works with every ShiftMass Complete System — Standard \u003cbr\u003e  Lockout and Large Lockout.\u003c\/p\u003e\n\u003cp style=\"text-align: left;\"\u003eNot sure which system fits your car? Check the Complete \u003cbr\u003eSystem fitment guide, or message us with your vehicle — \u003cbr\u003ewe'll verify before shipping.\u003c\/p\u003e\n\u003cp style=\"text-align: left;\"\u003eStreet Machine Works \u003c\/p\u003e","brand":"StreetMachineWorks","offers":[{"title":"Polished Black Anodized \/ 6-Speed • R Lower Right","offer_id":54071438704915,"sku":null,"price":85.0,"currency_code":"USD","in_stock":true},{"title":"Polished Black Anodized \/ 5-Speed • R Lower Right","offer_id":54074004308243,"sku":null,"price":85.0,"currency_code":"USD","in_stock":true},{"title":"Polished Black Anodized \/ 6-Speed • R Upper Left","offer_id":54074004341011,"sku":null,"price":85.0,"currency_code":"USD","in_stock":true},{"title":"Polished Black Anodized \/ 5-Speed • R Upper Left","offer_id":54074004373779,"sku":null,"price":85.0,"currency_code":"USD","in_stock":true},{"title":"Polished Black Anodized \/ No Engraving","offer_id":54074004406547,"sku":null,"price":85.0,"currency_code":"USD","in_stock":true},{"title":"Brushed Grey Anodized \/ 6-Speed • R Lower Right","offer_id":54071438737683,"sku":null,"price":85.0,"currency_code":"USD","in_stock":true},{"title":"Brushed Grey Anodized \/ 5-Speed • R Lower Right","offer_id":54074004439315,"sku":null,"price":85.0,"currency_code":"USD","in_stock":true},{"title":"Brushed Grey Anodized \/ 6-Speed • R Upper Left","offer_id":54074004472083,"sku":null,"price":85.0,"currency_code":"USD","in_stock":true},{"title":"Brushed Grey Anodized \/ 5-Speed • R Upper Left","offer_id":54074004504851,"sku":null,"price":85.0,"currency_code":"USD","in_stock":true},{"title":"Brushed Grey Anodized \/ No Engraving","offer_id":54074004537619,"sku":null,"price":85.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0946\/2562\/8435\/files\/archead111.jpg?v=1776882707","url":"https:\/\/shiftmass.com\/products\/shiftmass%e2%84%a2-new-knob-head","provider":"ShiftMass Systems","version":"1.0","type":"link"}