Sun Lines

by Sunshine K9s

1/4" Round Biothane Leashes and Long Lines

Custom Round Biothane Leashes

6′ Leash in Red with Medium Nickel plated Snap and Handle

Unique, ROUND Biothane leashes and long lines are 1/4″ in diameter and are a great alternative to leather and nylon leashes. 

They have many benefits, such as: 

  • very strong
  • lightweight
  • waterproof
  • stinkproof
  • stays flexible in cold weather
  • will not slip in your hands when wet
  • easy to clean
Round Biothane Long Line

12′ Long Line in Teal with Medium Nickel plated Snap, Stop at End and O-ring

Available in:

  • TEN colors
  • Six Snap choices in stock (custom snaps available)
  • any length you’d like
  • many different customization options!
    • with or without a handle
    • o-rings
    • stop at the end
    • leash couplers
    • handle with a snap
    • harness or collar strap

Great for:

  • Nose Work / scentwork sports
  • Tracking
  • Schutzhund / IPO
  • Dock diving
  • Training recalls
  • Hiking with your dog
  • Any dog activity!

LONG LINES for Nose Work,

Tracking & Schutzhund / IPO :

Round Biothane makes great long lines for dog training and for canine sports requiring long lines.

Distance markers can be placed at requested intervals so you can easily keep track of the amount of line let out. 

This Orange 40′ tracking line has black distance markers at 20′ and 30′ and no handle.
White distance markers also available.

It's so easy to
your own Sun Line!



All leashes come with a handle included.

The length of the leash is measured from the end of the snap where it attaches to the line to the end of the line, handle or stop.

Pricing includes any snap size in Brass or Nickel Plated Brass. 

Most Popular Lengths listed:

  •  4′  = $16
  •  6′  = $18
  •  8′  = $20
  • 10′ = $22
  • 12′ = $24
  • 15′ = $27
  • 16′ = $28
  • 20′ = $32
  • 30′ = $42
  • 33′ = $45
  • 40′ = $52

Email me for a quote on any length you’d like.



From left to Right:
Red, Neon Pink, Blaze Orange, Yellow, Neon Green, Teal, Blue, Purple, Brown & Black



Bolt snaps are generally made in three metal types:

– Zinc: Almost always nickel plated, these are the most commonly used snaps for leashes. 

– Brass: These are stronger than zinc and more resistant to corrosion. They come in many finishes. Our snaps are of the highest quality in both polished brass and nickel plated brass.

– Stainless Steel: The strongest of all snaps. We use a marine grade stainless steel snap.

Small Snaps: Best for small dogs where you want a light-weight snap, such as Shih Tzus, Yorkies, Coton de Tulears and Chihuahuas.
   Choose from Solid Brass or Nickel Plated Brass
   Length:  1.75″   /   Weight: 0.4 oz  (about 2 Quarters)

Medium Snaps: Great all round snap for all dog sizes, even strong pullers.
   Choose from Solid Brass or Nickel Plated Brass
   Length:  2.5″   /   Weight: 0.9 oz  (about 4 Quarters)

Large Snaps: Our Stainless Steel snaps have the largest eye for the thickest D or O-rings and can handle the toughest pullers such as Rotties, GSDs, Mastiffs and other strong breeds.
   Choose from Solid Brass or Stainless Steel
   BRASS:  Length:  3″   /  Weight: 1.1 oz  (about 5 Quarters)
   SS:  Length:  3.25″   /   Weight: 1.4 oz  (about 6 Quarters & 1 Nickel)

Trigger Snaps: This Medium-sized snap is made of Nickel-plated Zinc. It’s a great choice for people with large or arthritic hands. 
   Nickel Plated Zinc
   Length:  2.375″   /   Weight: 1.1 oz  (about 5 Quarters)

Image Above, Left to Right:

Top Row: Large, Medium and Small Snaps- all in Brass.

Bottom Row: Large Snap in Stainless Steel, Medium and Small Snaps in Nickel Plated Brass.



Leashes come standard with a Handle.

Add an O-ring if you’d like!

If you don’t want a handle but still want to have something to hold on to at the end of the line, choose a Stop at End. There is still enough space in the loop to add a carabiner or an O-ring.

The Drag Line option means the line will have nothing at the end.   
(See orange long line above)

Have a REALLY strong, high drive dog? Are you looking for a short leash or strap? Consider a Double Clamp at the snap for extra strength.

This strap has a Double Clamp at the Snap with a Stop and an O-ring at the other end.

Looking for something more customized?
Email me!


  • Large Stainless Steel Snap, + $2
  • Trigger Snap, + $2
  • Drag line (nothing at end), -$2
  • Stop at End, -$1
  • Double Clamp at Snap, +2
  • O-ring, +$1
  • Distance Markers, Black or White, +$1 each

Sun Lines Order Form:

1/4" Round Biothane Leashes

Once I receive your order, I will email you with a total for your order including taxes, shipping options and how to submit payment. If you don’t hear from me after 2 days, email me.

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